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158 results on '"Ilchen, M."'

1. Isotope effects in dynamics of water isotopologues induced by core ionization at an x-ray free-electron laser

Author

Guillemin, R, Inhester, L, Ilchen, M, Mazza, T, Boll, R, Weber, Th, Eckart, S, Grychtol, P, Rennhack, N, Marchenko, T, Velasquez, N, Travnikova, O, Ismail, I, Niskanen, J, Kukk, E, Trinter, F, Gisselbrecht, M, Feifel, R, Sansone, G, Rolles, D, Martins, M, Meyer, M, Simon, M, Santra, R, Pfeifer, T, Jahnke, T, and Piancastelli, MN

Subjects
Physical Sciences, Chemical Sciences, Atomic, Molecular and Optical Physics, Physical Chemistry, Physical chemistry, Condensed matter physics, Particle and high energy physics
Abstract

Dynamical response of water exposed to x-rays is of utmost importance in a wealth of science areas. We exposed isolated water isotopologues to short x-ray pulses from a free-electron laser and detected momenta of all produced ions in coincidence. By combining experimental results and theoretical modeling, we identify significant structural dynamics with characteristic isotope effects in H2O2+, D2O2+, and HDO2+, such as asymmetric bond elongation and bond-angle opening, leading to two-body or three-body fragmentation on a timescale of a few femtoseconds. A method to disentangle the sequences of events taking place upon the consecutive absorption of two x-ray photons is described. The obtained deep look into structural properties and dynamics of dissociating water isotopologues provides essential insights into the underlying mechanisms.

Published
2023

2. Investigating charge-up and fragmentation dynamics of oxygen molecules after interaction with strong X-ray free-electron laser pulses

Author

Kastirke, G, Ota, F, Rezvan, DV, Schöffler, MS, Weller, M, Rist, J, Boll, R, Anders, N, Baumann, TM, Eckart, S, Erk, B, De Fanis, A, Fehre, K, Gatton, A, Grundmann, S, Grychtol, P, Hartung, A, Hofmann, M, Ilchen, M, Janke, C, Kircher, M, Kunitski, M, Li, X, Mazza, T, Melzer, N, Montano, J, Music, V, Nalin, G, Ovcharenko, Y, Pier, A, Rennhack, N, Rivas, DE, Dörner, R, Rolles, D, Rudenko, A, Schmidt, Ph, Siebert, J, Strenger, N, Trabert, D, Vela-Perez, I, Wagner, R, Weber, Th, Williams, JB, Ziolkowski, P, Schmidt, L Ph H, Czasch, A, Tamura, Y, Hara, N, Yamazaki, K, Hatada, K, Trinter, F, Meyer, M, Ueda, K, Demekhin, Ph V, and Jahnke, T

Subjects
Physical Sciences, Chemical Sciences, Atomic, Molecular and Optical Physics, Physical Chemistry, Chemical Physics
Abstract

During the last decade, X-ray free-electron lasers (XFELs) have enabled the study of light-matter interaction under extreme conditions. Atoms which are subject to XFEL radiation are charged by a complex interplay of (several subsequent) photoionization events and electronic decay processes within a few femtoseconds. The interaction with molecules is even more intriguing, since intricate nuclear dynamics occur as the molecules start to dissociate during the charge-up process. Here, we demonstrate that by analyzing photoelectron angular emission distributions and kinetic energy release of charge states of ionic molecular fragments, we can obtain a detailed understanding of the charge-up and fragmentation dynamics. Our novel approach allows for gathering such information without the need of complex ab initio modeling. As an example, we provide a detailed view on the processes happening on a femtosecond time scale in oxygen molecules exposed to intense XFEL pulses.

Published
2022

3. Photoelectron circular dichroism of O 1$s$-photoelectrons of uniaxially oriented trifluoromethyloxirane: Energy dependence and sensitivity to molecular configuration

Author

Nalin, G., Fehre, K., Trinter, F., Novikovskiy, N. M., Anders, N., Trabert, D., Grundmann, S., Kircher, M., Khan, A., Tomar, R., Hofmann, M., Waitz, M., Vela-Perez, I., Fukuzawa, H., Ueda, K., Williams, J., Kargin, D., Maurer, M., Küstner-Wetekam, C., Marder, L., Viehmann, J., Knie, A., Jahnke, T., Ilchen, M., Dörner, R., Pietschnig, R., Demekhin, Ph. V., and Schöffler, M. S.

Subjects
Physics - Chemical Physics, Physics - Atomic and Molecular Clusters
Abstract

The photoelectron circular dichroism (PECD) of the O 1s-photoelectrons of trifluoromethyloxirane(TFMOx) is studied experimentally and theoretically for different photoelectron kinetic energies. The experiments were performed employing circularly polarized synchrotron radiation and coincidentelectron and fragment ion detection using Cold Target Recoil Ion Momentum Spectroscopy. The corresponding calculations were performed by means of the Single Center method within the relaxed-core Hartree-Fock approximation. We concentrate on the energy dependence of the differential PECD of uniaxially oriented TFMOx molecules, which is accessible through the employed coincident detection. We also compare results for differential PECD of TFMOx to those obtained for the equivalent fragmentation channel and similar photoelectron kinetic energy of methyloxirane (MOx), studied in our previous work. Thereby, we investigate the influence of the substitution of the methyl-group by the trifluoromethyl-group at the chiral center on the molecular chiral response. Finally, the presently obtained angular distribution parameters are compared to those available in literature., Comment: 6 figs

Published
2021
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4. Inner-Shell-Ionization-Induced Femtosecond Structural Dynamics of Water Molecules Imaged at an X-Ray Free-Electron Laser

Author

Jahnke, T, Guillemin, R, Inhester, L, Son, S-K, Kastirke, G, Ilchen, M, Rist, J, Trabert, D, Melzer, N, Anders, N, Mazza, T, Boll, R, De Fanis, A, Music, V, Weber, Th, Weller, M, Eckart, S, Fehre, K, Grundmann, S, Hartung, A, Hofmann, M, Janke, C, Kircher, M, Nalin, G, Pier, A, Siebert, J, Strenger, N, Vela-Perez, I, Baumann, TM, Grychtol, P, Montano, J, Ovcharenko, Y, Rennhack, N, Rivas, DE, Wagner, R, Ziolkowski, P, Schmidt, P, Marchenko, T, Travnikova, O, Journel, L, Ismail, I, Kukk, E, Niskanen, J, Trinter, F, Vozzi, C, Devetta, M, Stagira, S, Gisselbrecht, M, Jäger, AL, Li, X, Malakar, Y, Martins, M, Feifel, R, Schmidt, L Ph H, Czasch, A, Sansone, G, Rolles, D, Rudenko, A, Moshammer, R, Dörner, R, Meyer, M, Pfeifer, T, Schöffler, MS, Santra, R, Simon, M, and Piancastelli, MN

Subjects
Atomic, Molecular and Optical Physics, Physical Sciences, Astronomical and Space Sciences, Condensed Matter Physics, Quantum Physics, Physical sciences
Abstract

The ultrafast structural dynamics of water following inner-shell ionization is a crucial issue in high-energy radiation chemistry. We have exposed isolated water molecules to a short X-ray pulse from a free-electron laser and detected momenta of all produced ions in coincidence. By combining experimental results and theoretical modeling, we can image dissociation dynamics of individual molecules in unprecedented detail. We reveal significant molecular structural dynamics in H2O2+, such as asymmetric deformation and bond-angle opening, leading to two-body or three-body fragmentation on a timescale of a few femtoseconds. We thus reconstruct several snapshots of structural dynamics at different time intervals, which highlight dynamical patterns that are relevant as initiating steps of subsequent radiation-damage processes.

Published
2021

5. Clocking Auger Electrons

Author

Haynes, D. C., Wurzer, M., Schletter, A., Al-Haddad, A., Blaga, C., Bostedt, C., Bozek, J., Bucher, M., Camper, A., Carron, S., Coffee, R., Costello, J. T., DiMauro, L. F., Ding, Y., Ferguson, K., Grguraš, I., Helml, W., Hoffmann, M. C., Ilchen, M., Jalas, S., Kabachnik, N. M., Kazansky, A. K., Kienberger, R., Maier, A. R., Maxwell, T., Mazza, T., Meyer, M., Park, H., Robinson, J. S., Roedig, C., Schlarb, H., Singla, R., Tellkamp, F., Zhang, K., Doumy, G., Behrens, C., and Cavalieri, A. L.

Subjects
Physics - Atomic Physics
Abstract

Intense X-ray free-electron lasers (XFELs) can rapidly excite matter, leaving it in inherently unstable states that decay on femtosecond timescales. As the relaxation occurs primarily via Auger emission, excited state observations are constrained by Auger decay. In situ measurement of this process is therefore crucial, yet it has thus far remained elusive at XFELs due to inherent timing and phase jitter, which can be orders of magnitude larger than the timescale of Auger decay. Here, we develop a new approach termed self-referenced attosecond streaking, based upon simultaneous measurements of streaked photo- and Auger electrons. Our technique enables sub-femtosecond resolution in spite of jitter. We exploit this method to make the first XFEL time-domain measurement of the Auger decay lifetime in atomic neon, and, by using a fully quantum-mechanical description, retrieve a lifetime of $2.2^{ + 0.2}_{ - 0.3}$ fs for the KLL decay channel. Importantly, our technique can be generalised to permit the extension of attosecond time-resolved experiments to all current and future FEL facilities., Comment: Main text: 20 pages, 3 figures. Supplementary information: 17 pages, 6 figures

Published
2020
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6. Recovery of high-energy photoelectron circular dichroism through Fano interference

Author

Hartmann, G., Ilchen, M., Schmidt, Ph., Küstner-Wetekam, C., Ozga, C., Scholz, F., Buck, J., Trinter, F., Viefhaus, J., Ehresmann, A., Schöffler, M. S., Knie, A., and Demekhin, Ph. V.

Subjects
Physics - Atomic and Molecular Clusters
Abstract

It is commonly accepted that the magnitude of a photoelectron circular dichroism (PECD) is governed by the ability of an outgoing photoelectron wave packet to probe the chiral asymmetry of a molecule. To be able to accumulate this characteristic asymmetry while escaping the chiral ion, photoelectrons need to have relatively small kinetic energies of up to a few tens of electron volts. Here, we demonstrate a substantial PECD for very fast photoelectrons above 500 eV kinetic energy released from methyloxirane by a participator resonant Auger decay of its lowermost O $1s$-excitation. This effect emerges as a result of the Fano interference between the direct and resonant photoionization pathways, notwithstanding that their individual effects are negligibly small. The resulting dichroic parameter has an anomalous dispersion, i.e. it changes its sign across the resonance, which can be considered as an analogue of the Cotton effect in the X-ray regime., Comment: 2 figures

Published
2019
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7. Photoelectron Diffraction Imaging of a Molecular Breakup Using an X-Ray Free-Electron Laser

Author

Kastirke, G, Schöffler, MS, Weller, M, Rist, J, Boll, R, Anders, N, Baumann, TM, Eckart, S, Erk, B, De Fanis, A, Fehre, K, Gatton, A, Grundmann, S, Grychtol, P, Hartung, A, Hofmann, M, Ilchen, M, Janke, C, Kircher, M, Kunitski, M, Li, X, Mazza, T, Melzer, N, Montano, J, Music, V, Nalin, G, Ovcharenko, Y, Pier, A, Rennhack, N, Rivas, DE, Dörner, R, Rolles, D, Rudenko, A, Schmidt, P, Siebert, J, Strenger, N, Trabert, D, Vela-Perez, I, Wagner, R, Weber, T, Williams, JB, Ziolkowski, P, Schmidt, LPH, Czasch, A, Trinter, F, Meyer, M, Ueda, K, Demekhin, PV, and Jahnke, T

Subjects
Astronomical and Space Sciences, Condensed Matter Physics, Quantum Physics
Abstract

A central motivation for the development of x-ray free-electron lasers has been the prospect of time-resolved single-molecule imaging with atomic resolution. Here, we show that x-ray photoelectron diffraction - where a photoelectron emitted after x-ray absorption illuminates the molecular structure from within - can be used to image the increase of the internuclear distance during the x-ray-induced fragmentation of an O2 molecule. By measuring the molecular-frame photoelectron emission patterns for a two-photon sequential K-shell ionization in coincidence with the fragment ions, and by sorting the data as a function of the measured kinetic energy release, we can resolve the elongation of the molecular bond by approximately 1.2 a.u. within the duration of the x-ray pulse. The experiment paves the road toward time-resolved pump-probe photoelectron diffraction imaging at high-repetition-rate x-ray free-electron lasers.

Published
2020

8. Femtosecond profiling of shaped X-ray pulses

Author

Hoffmann, M. C., Grguraš, I., Behrens, C., Bostedt, C., Bozek, J., Bromberger, H., Coffee, R., Costello, J. T., DiMauro, L. F., Ding, Y., Doumy, G., Helml, W., Ilchen, M., Kienberger, R., Lee, S., Maier, A. R., Mazza, T., Meyer, M., Messerschmidt, M., Schorb, S., Schweinberger, W., Zhang, K., and Cavalieri, A. L.

Subjects
Physics - Accelerator Physics, Physics - Optics
Abstract

Arbitrary manipulation of the temporal and spectral properties of X-ray pulses at free-electron lasers (FELs) would revolutionize many experimental applications. At the Linac Coherent Light Source at Stanford National Accelerator Laboratory, the momentum phase-space of the FEL driving electron bunch can be tuned to emit a pair of X-ray pulses with independently variable photon energy and femtosecond delay. However, while accelerator parameters can easily be adjusted to tune the electron bunch phase-space, the final impact of these actuators on the X-ray pulse cannot be predicted with sufficient precision. Furthermore, shot-to-shot instabilities that distort the pulse shape unpredictably cannot be fully suppressed. Therefore, the ability to directly characterize the X-rays is essential to ensure precise and consistent control. In this work, we have generated X-ray pulse pairs and characterized them on a single-shot basis with femtosecond resolution through time-resolved photoelectron streaking spectroscopy. This achievement completes an important step toward future X-ray pulse shaping techniques.

Published
2017
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9. Emitter-site selective photoelectron circular dichroism of trifluoromethyloxirane

Author

Ilchen, M., Hartmann, G., Rupprecht, P., Artemyev, A. N., Coffee, R. N., Li, Z., Ohldag, H., Ogasawara, H., Osipov, T., Ray, D., Schmidt, Ph., Wolf, T. J. A., Ehresmann, A., Moeller, S., Knie, A., and Demekhin, Ph. V.

Subjects
Physics - Chemical Physics
Abstract

The angle-resolved inner-shell photoionization of R-trifluoromethyloxirane, C3H3F3O, is studied experimentally and theoretically. Thereby, we investigate the photoelectron circular dichroism (PECD) for nearly-symmetric O 1s and F 1s electronic orbitals, which are localized on different molecular sites. The respective dichroic $\beta_{1}$ and angular distribution $\beta_{2}$ parameters are measured at the photoelectron kinetic energies from 1 to 16 eV by using variably polarized synchrotron radiation and velocity map imaging spectroscopy. The present experimental results are in good agreement with the outcome of ab initio electronic structure calculations. We report a sizable chiral asymmetry $\beta_{1}$ of up to about 9% for the K-shell photoionization of oxygen atom. For the individual fluorine atoms, the present calculations predict asymmetries of similar size. However, being averaged over all fluorine atoms, it drops down to about 2%, as also observed in the present experiment. Our study demonstrates a strong emitter- and site-sensitivity of PECD in the one-photon inner-shell ionization of this chiral molecule.

Published
2017
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10. Machine learning applied to single-shot x-ray diagnostics in an XFEL

Author

Sanchez-Gonzalez, A., Micaelli, P., Olivier, C., Barillot, T. R., Ilchen, M., Lutman, A. A., Marinelli, A., Maxwell, T., Achner, A., Agåker, M., Berrah, N., Bostedt, C., Buck, J., Bucksbaum, P. H., Montero, S. Carron, Cooper, B., Cryan, J. P., Dong, M., Feifel, R., Frasinski, L. J., Fukuzawa, H., Galler, A., Hartmann, G., Hartmann, N., Helml, W., Johnson, A. S., Knie, A., Lindahl, A. O., Liu, J., Motomura, K., Mucke, M., O'Grady, C., Rubensson, J-E., Simpson, E. R., Squibb, R. J., Såthe, C., Ueda, K., Vacher, M., Walke, D. J., Zhaunerchyk, V., Coffee, R. N., and Marangos, J. P.

Subjects
Physics - Data Analysis, Statistics and Probability, Physics - Accelerator Physics, Statistics - Machine Learning
Abstract

X-ray free-electron lasers (XFELs) are the only sources currently able to produce bright few-fs pulses with tunable photon energies from 100 eV to more than 10 keV. Due to the stochastic SASE operating principles and other technical issues the output pulses are subject to large fluctuations, making it necessary to characterize the x-ray pulses on every shot for data sorting purposes. We present a technique that applies machine learning tools to predict x-ray pulse properties using simple electron beam and x-ray parameters as input. Using this technique at the Linac Coherent Light Source (LCLS), we report mean errors below 0.3 eV for the prediction of the photon energy at 530 eV and below 1.6 fs for the prediction of the delay between two x-ray pulses. We also demonstrate spectral shape prediction with a mean agreement of 97%. This approach could potentially be used at the next generation of high-repetition-rate XFELs to provide accurate knowledge of complex x-ray pulses at the full repetition rate., Comment: 12 pages, 8 figures

Published
2016
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11. Clocking Auger electrons

Author

Haynes, D. C., Wurzer, M., Schletter, A., Al-Haddad, A., Blaga, C., Bostedt, C., Bozek, J., Bromberger, H., Bucher, M., Camper, A., Carron, S., Coffee, R., Costello, J. T., DiMauro, L. F., Ding, Y., Ferguson, K., Grguraš, I., Helml, W., Hoffmann, M. C., Ilchen, M., Jalas, S., Kabachnik, N. M., Kazansky, A. K., Kienberger, R., Maier, A. R., Maxwell, T., Mazza, T., Meyer, M., Park, H., Robinson, J., Roedig, C., Schlarb, H., Singla, R., Tellkamp, F., Walker, P. A., Zhang, K., Doumy, G., Behrens, C., and Cavalieri, A. L.

Published
2021
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12. A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator

Author

Decking, W., Abeghyan, S., Abramian, P., Abramsky, A., Aguirre, A., Albrecht, C., Alou, P., Altarelli, M., Altmann, P., Amyan, K., Anashin, V., Apostolov, E., Appel, K., Auguste, D., Ayvazyan, V., Baark, S., Babies, F., Baboi, N., Bak, P., Balandin, V., Baldinger, R., Baranasic, B., Barbanotti, S., Belikov, O., Belokurov, V., Belova, L., Belyakov, V., Berry, S., Bertucci, M., Beutner, B., Block, A., Blöcher, M., Böckmann, T., Bohm, C., Böhnert, M., Bondar, V., Bondarchuk, E., Bonezzi, M., Borowiec, P., Bösch, C., Bösenberg, U., Bosotti, A., Böspflug, R., Bousonville, M., Boyd, E., Bozhko, Y., Brand, A., Branlard, J., Briechle, S., Brinker, F., Brinker, S., Brinkmann, R., Brockhauser, S., Brovko, O., Brück, H., Brüdgam, A., Butkowski, L., Büttner, T., Calero, J., Castro-Carballo, E., Cattalanotto, G., Charrier, J., Chen, J., Cherepenko, A., Cheskidov, V., Chiodini, M., Chong, A., Choroba, S., Chorowski, M., Churanov, D., Cichalewski, W., Clausen, M., Clement, W., Cloué, C., Cobos, J. A., Coppola, N., Cunis, S., Czuba, K., Czwalinna, M., D’Almagne, B., Dammann, J., Danared, H., de Zubiaurre Wagner, A., Delfs, A., Delfs, T., Dietrich, F., Dietrich, T., Dohlus, M., Dommach, M., Donat, A., Dong, X., Doynikov, N., Dressel, M., Duda, M., Duda, P., Eckoldt, H., Ehsan, W., Eidam, J., Eints, F., Engling, C., Englisch, U., Ermakov, A., Escherich, K., Eschke, J., Saldin, E., Faesing, M., Fallou, A., Felber, M., Fenner, M., Fernandes, B., Fernández, J. M., Feuker, S., Filippakopoulos, K., Floettmann, K., Fogel, V., Fontaine, M., Francés, A., Martin, I. Freijo, Freund, W., Freyermuth, T., Friedland, M., Fröhlich, L., Fusetti, M., Fydrych, J., Gallas, A., García, O., Garcia-Tabares, L., Geloni, G., Gerasimova, N., Gerth, C., Geßler, P., Gharibyan, V., Gloor, M., Głowinkowski, J., Goessel, A., Gołębiewski, Z., Golubeva, N., Grabowski, W., Graeff, W., Grebentsov, A., Grecki, M., Grevsmuehl, T., Gross, M., Grosse-Wortmann, U., Grünert, J., Grunewald, S., Grzegory, P., Feng, G., Guler, H., Gusev, G., Gutierrez, J. L., Hagge, L., Hamberg, M., Hanneken, R., Harms, E., Hartl, I., Hauberg, A., Hauf, S., Hauschildt, J., Hauser, J., Havlicek, J., Hedqvist, A., Heidbrook, N., Hellberg, F., Henning, D., Hensler, O., Hermann, T., Hidvégi, A., Hierholzer, M., Hintz, H., Hoffmann, F., Hoffmann, Markus, Hoffmann, Matthias, Holler, Y., Hüning, M., Ignatenko, A., Ilchen, M., Iluk, A., Iversen, J., Iversen, J., Izquierdo, M., Jachmann, L., Jardon, N., Jastrow, U., Jensch, K., Jensen, J., Jeżabek, M., Jidda, M., Jin, H., Johansson, N., Jonas, R., Kaabi, W., Kaefer, D., Kammering, R., Kapitza, H., Karabekyan, S., Karstensen, S., Kasprzak, K., Katalev, V., Keese, D., Keil, B., Kholopov, M., Killenberger, M., Kitaev, B., Klimchenko, Y., Klos, R., Knebel, L., Koch, A., Koepke, M., Köhler, S., Köhler, W., Kohlstrunk, N., Konopkova, Z., Konstantinov, A., Kook, W., Koprek, W., Körfer, M., Korth, O., Kosarev, A., Kosiński, K., Kostin, D., Kot, Y., Kotarba, A., Kozak, T., Kozak, V., Kramert, R., Krasilnikov, M., Krasnov, A., Krause, B., Kravchuk, L., Krebs, O., Kretschmer, R., Kreutzkamp, J., Kröplin, O., Krzysik, K., Kube, G., Kuehn, H., Kujala, N., Kulikov, V., Kuzminych, V., La Civita, D., Lacroix, M., Lamb, T., Lancetov, A., Larsson, M., Le Pinvidic, D., Lederer, S., Lensch, T., Lenz, D., Leuschner, A., Levenhagen, F., Li, Y., Liebing, J., Lilje, L., Limberg, T., Lipka, D., List, B., Liu, J., Liu, S., Lorbeer, B., Lorkiewicz, J., Lu, H. H., Ludwig, F., Machau, K., Maciocha, W., Madec, C., Magueur, C., Maiano, C., Maksimova, I., Malcher, K., Maltezopoulos, T., Mamoshkina, E., Manschwetus, B., Marcellini, F., Marinkovic, G., Martinez, T., Martirosyan, H., Maschmann, W., Maslov, M., Matheisen, A., Mavric, U., Meißner, J., Meissner, K., Messerschmidt, M., Meyners, N., Michalski, G., Michelato, P., Mildner, N., Moe, M., Moglia, F., Mohr, C., Mohr, S., Möller, W., Mommerz, M., Monaco, L., Montiel, C., Moretti, M., Morozov, I., Morozov, P., Mross, D., Mueller, J., Müller, C., Müller, J., Müller, K., Munilla, J., Münnich, A., Muratov, V., Napoly, O., Näser, B., Nefedov, N., Neumann, Reinhard, Neumann, Rudolf, Ngada, N., Noelle, D., Obier, F., Okunev, I., Oliver, J. A., Omet, M., Oppelt, A., Ottmar, A., Oublaid, M., Pagani, C., Paparella, R., Paramonov, V., Peitzmann, C., Penning, J., Perus, A., Peters, F., Petersen, B., Petrov, A., Petrov, I., Pfeiffer, S., Pflüger, J., Philipp, S., Pienaud, Y., Pierini, P., Pivovarov, S., Planas, M., Pławski, E., Pohl, M., Polinski, J., Popov, V., Prat, S., Prenting, J., Priebe, G., Pryschelski, H., Przygoda, K., Pyata, E., Racky, B., Rathjen, A., Ratuschni, W., Regnaud-Campderros, S., Rehlich, K., Reschke, D., Robson, C., Roever, J., Roggli, M., Rothenburg, J., Rusiński, E., Rybaniec, R., Sahling, H., Salmani, M., Samoylova, L., Sanzone, D., Saretzki, F., Sawlanski, O., Schaffran, J., Schlarb, H., Schlösser, M., Schlott, V., Schmidt, C., Schmidt-Foehre, F., Schmitz, M., Schmökel, M., Schnautz, T., Schneidmiller, E., Scholz, M., Schöneburg, B., Schultze, J., Schulz, C., Schwarz, A., Sekutowicz, J., Sellmann, D., Semenov, E., Serkez, S., Sertore, D., Shehzad, N., Shemarykin, P., Shi, L., Sienkiewicz, M., Sikora, D., Sikorski, M., Silenzi, A., Simon, C., Singer, W., Singer, X., Sinn, H., Sinram, K., Skvorodnev, N., Smirnow, P., Sommer, T., Sorokin, A., Stadler, M., Steckel, M., Steffen, B., Steinhau-Kühl, N., Stephan, F., Stodulski, M., Stolper, M., Sulimov, A., Susen, R., Świerblewski, J., Sydlo, C., Syresin, E., Sytchev, V., Szuba, J., Tesch, N., Thie, J., Thiebault, A., Tiedtke, K., Tischhauser, D., Tolkiehn, J., Tomin, S., Tonisch, F., Toral, F., Torbin, I., Trapp, A., Treyer, D., Trowitzsch, G., Trublet, T., Tschentscher, T., Ullrich, F., Vannoni, M., Varela, P., Varghese, G., Vashchenko, G., Vasic, M., Vazquez-Velez, C., Verguet, A., Vilcins-Czvitkovits, S., Villanueva, R., Visentin, B., Viti, M., Vogel, E., Volobuev, E., Wagner, R., Walker, N., Wamsat, T., Weddig, H., Weichert, G., Weise, H., Wenndorf, R., Werner, M., Wichmann, R., Wiebers, C., Wiencek, M., Wilksen, T., Will, I., Winkelmann, L., Winkowski, M., Wittenburg, K., Witzig, A., Wlk, P., Wohlenberg, T., Wojciechowski, M., Wolff-Fabris, F., Wrochna, G., Wrona, K., Yakopov, M., Yang, B., Yang, F., Yurkov, M., Zagorodnov, I., Zalden, P., Zavadtsev, A., Zavadtsev, D., Zhirnov, A., Zhukov, A., Ziemann, V., Zolotov, A., Zolotukhina, N., Zummack, F., and Zybin, D.

Published
2020
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13. Stimulated X-Ray Raman Scattering with Free-Electron Laser Sources

Author

Rohringer, N., Kimberg, V., Weninger, C., Sanchez-Gonzalez, A., Lutman, A., Maxwell, T., Bostedt, C., Carron Monterro, S., Lindahl, A. O., Ilchen, M., Coffee, R. N., Bozek, J. D., Krzywinski, J., Kierspel, T., Mullins, T., Küpper, J., Erk, B., Rolles, D., Mücke, O. D., London, R. A., Purvis, M., Ryan, D., Rocca, J. J., Feifel, R., Squibb, R., Zhaunerchyk, V., Såthe, C., Agåker, M., Mucke, M., Nordgren, J., Rubensson, J. E., Rocca, Jorge, editor, Menoni, Carmen, editor, and Marconi, Mario, editor

Published
2016
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14. Attosecond time–energy structure of X-ray free-electron laser pulses

Author

Hartmann, N., Hartmann, G., Heider, R., Wagner, M. S., Ilchen, M., Buck, J., Lindahl, A. O., Benko, C., Grünert, J., Krzywinski, J., Liu, J., Lutman, A. A., Marinelli, A., Maxwell, T., Miahnahri, A. A., Moeller, S. P., Planas, M., Robinson, J., Kazansky, A. K., Kabachnik, N. M., Viefhaus, J., Feurer, T., Kienberger, R., Coffee, R. N., and Helml, W.

Published
2018
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15. Controlling Fragmentation of the Acetylene Cation in the Vacuum Ultraviolet via Transient Molecular Alignment

Author

Varvarezos, L., primary, Delgado-Guerrero, J., additional, Di Fraia, M., additional, Kelly, T. J., additional, Palacios, A., additional, Callegari, C., additional, Cavalieri, A. L., additional, Coffee, R., additional, Danailov, M., additional, Decleva, P., additional, Demidovich, A., additional, DiMauro, L., additional, Düsterer, S., additional, Giannessi, L., additional, Helml, W., additional, Ilchen, M., additional, Kienberger, R., additional, Mazza, T., additional, Meyer, M., additional, Moshammer, R., additional, Pedersini, C., additional, Plekan, O., additional, Prince, K. C., additional, Simoncig, A., additional, Schletter, A., additional, Ueda, K., additional, Wurzer, M., additional, Zangrando, M., additional, Martín, F., additional, and Costello, J. T., additional

Published
2022
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16. Author Correction: A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator

Author

Decking, W., Abeghyan, S., Abramian, P., Abramsky, A., Aguirre, A., Albrecht, C., Alou, P., Altarelli, M., Altmann, P., Amyan, K., Anashin, V., Apostolov, E., Appel, K., Auguste, D., Ayvazyan, V., Baark, S., Babies, F., Baboi, N., Bak, P., Balandin, V., Baldinger, R., Baranasic, B., Barbanotti, S., Belikov, O., Belokurov, V., Belova, L., Belyakov, V., Berry, S., Bertucci, M., Beutner, B., Block, A., Blöcher, M., Böckmann, T., Bohm, C., Böhnert, M., Bondar, V., Bondarchuk, E., Bonezzi, M., Borowiec, P., Bösch, C., Bösenberg, U., Bosotti, A., Böspflug, R., Bousonville, M., Boyd, E., Bozhko, Y., Brand, A., Branlard, J., Briechle, S., Brinker, F., Brinker, S., Brinkmann, R., Brockhauser, S., Brovko, O., Brück, H., Brüdgam, A., Butkowski, L., Büttner, T., Calero, J., Castro-Carballo, E., Cattalanotto, G., Charrier, J., Chen, J., Cherepenko, A., Cheskidov, V., Chiodini, M., Chong, A., Choroba, S., Chorowski, M., Churanov, D., Cichalewski, W., Clausen, M., Clement, W., Cloué, C., Cobos, J. A., Coppola, N., Cunis, S., Czuba, K., Czwalinna, M., D’Almagne, B., Dammann, J., Danared, H., de Zubiaurre Wagner, A., Delfs, A., Delfs, T., Dietrich, F., Dietrich, T., Dohlus, M., Dommach, M., Donat, A., Dong, X., Doynikov, N., Dressel, M., Duda, M., Duda, P., Eckoldt, H., Ehsan, W., Eidam, J., Eints, F., Engling, C., Englisch, U., Ermakov, A., Escherich, K., Eschke, J., Saldin, E., Faesing, M., Fallou, A., Felber, M., Fenner, M., Fernandes, B., Fernández, J. M., Feuker, S., Filippakopoulos, K., Floettmann, K., Fogel, V., Fontaine, M., Francés, A., Martin, I. Freijo, Freund, W., Freyermuth, T., Friedland, M., Fröhlich, L., Fusetti, M., Fydrych, J., Gallas, A., García, O., Garcia-Tabares, L., Geloni, G., Gerasimova, N., Gerth, C., Geßler, P., Gharibyan, V., Gloor, M., Głowinkowski, J., Goessel, A., Gołębiewski, Z., Golubeva, N., Grabowski, W., Graeff, W., Grebentsov, A., Grecki, M., Grevsmuehl, T., Gross, M., Grosse-Wortmann, U., Grünert, J., Grunewald, S., Grzegory, P., Feng, G., Guler, H., Gusev, G., Gutierrez, J. L., Hagge, L., Hamberg, M., Hanneken, R., Harms, E., Hartl, I., Hauberg, A., Hauf, S., Hauschildt, J., Hauser, J., Havlicek, J., Hedqvist, A., Heidbrook, N., Hellberg, F., Henning, D., Hensler, O., Hermann, T., Hidvégi, A., Hierholzer, M., Hintz, H., Hoffmann, F., Hoffmann, Markus, Hoffmann, Matthias, Holler, Y., Hüning, M., Ignatenko, A., Ilchen, M., Iluk, A., Iversen, J., Iversen, J., Izquierdo, M., Jachmann, L., Jardon, N., Jastrow, U., Jensch, K., Jensen, J., Jeżabek, M., Jidda, M., Jin, H., Johansson, N., Jonas, R., Kaabi, W., Kaefer, D., Kammering, R., Kapitza, H., Karabekyan, S., Karstensen, S., Kasprzak, K., Katalev, V., Keese, D., Keil, B., Kholopov, M., Killenberger, M., Kitaev, B., Klimchenko, Y., Klos, R., Knebel, L., Koch, A., Koepke, M., Köhler, S., Köhler, W., Kohlstrunk, N., Konopkova, Z., Konstantinov, A., Kook, W., Koprek, W., Körfer, M., Korth, O., Kosarev, A., Kosiński, K., Kostin, D., Kot, Y., Kotarba, A., Kozak, T., Kozak, V., Kramert, R., Krasilnikov, M., Krasnov, A., Krause, B., Kravchuk, L., Krebs, O., Kretschmer, R., Kreutzkamp, J., Kröplin, O., Krzysik, K., Kube, G., Kuehn, H., Kujala, N., Kulikov, V., Kuzminych, V., La Civita, D., Lacroix, M., Lamb, T., Lancetov, A., Larsson, M., Le Pinvidic, D., Lederer, S., Lensch, T., Lenz, D., Leuschner, A., Levenhagen, F., Li, Y., Liebing, J., Lilje, L., Limberg, T., Lipka, D., List, B., Liu, J., Liu, S., Lorbeer, B., Lorkiewicz, J., Lu, H. H., Ludwig, F., Machau, K., Maciocha, W., Madec, C., Magueur, C., Maiano, C., Maksimova, I., Malcher, K., Maltezopoulos, T., Mamoshkina, E., Manschwetus, B., Marcellini, F., Marinkovic, G., Martinez, T., Martirosyan, H., Maschmann, W., Maslov, M., Matheisen, A., Mavric, U., Meißner, J., Meissner, K., Messerschmidt, M., Meyners, N., Michalski, G., Michelato, P., Mildner, N., Moe, M., Moglia, F., Mohr, C., Mohr, S., Möller, W., Mommerz, M., Monaco, L., Montiel, C., Moretti, M., Morozov, I., Morozov, P., Mross, D., Mueller, J., Müller, C., Müller, J., Müller, K., Munilla, J., Münnich, A., Muratov, V., Napoly, O., Näser, B., Nefedov, N., Neumann, Reinhard, Neumann, Rudolf, Ngada, N., Noelle, D., Obier, F., Okunev, I., Oliver, J. A., Omet, M., Oppelt, A., Ottmar, A., Oublaid, M., Pagani, C., Paparella, R., Paramonov, V., Peitzmann, C., Penning, J., Perus, A., Peters, F., Petersen, B., Petrov, A., Petrov, I., Pfeiffer, S., Pflüger, J., Philipp, S., Pienaud, Y., Pierini, P., Pivovarov, S., Planas, M., Pławski, E., Pohl, M., Polinski, J., Popov, V., Prat, S., Prenting, J., Priebe, G., Pryschelski, H., Przygoda, K., Pyata, E., Racky, B., Rathjen, A., Ratuschni, W., Regnaud-Campderros, S., Rehlich, K., Reschke, D., Robson, C., Roever, J., Roggli, M., Rothenburg, J., Rusiński, E., Rybaniec, R., Sahling, H., Salmani, M., Samoylova, L., Sanzone, D., Saretzki, F., Sawlanski, O., Schaffran, J., Schlarb, H., Schlösser, M., Schlott, V., Schmidt, C., Schmidt-Foehre, F., Schmitz, M., Schmökel, M., Schnautz, T., Schneidmiller, E., Scholz, M., Schöneburg, B., Schultze, J., Schulz, C., Schwarz, A., Sekutowicz, J., Sellmann, D., Semenov, E., Serkez, S., Sertore, D., Shehzad, N., Shemarykin, P., Shi, L., Sienkiewicz, M., Sikora, D., Sikorski, M., Silenzi, A., Simon, C., Singer, W., Singer, X., Sinn, H., Sinram, K., Skvorodnev, N., Smirnow, P., Sommer, T., Sorokin, A., Stadler, M., Steckel, M., Steffen, B., Steinhau-Kühl, N., Stephan, F., Stodulski, M., Stolper, M., Sulimov, A., Susen, R., Świerblewski, J., Sydlo, C., Syresin, E., Sytchev, V., Szuba, J., Tesch, N., Thie, J., Thiebault, A., Tiedtke, K., Tischhauser, D., Tolkiehn, J., Tomin, S., Tonisch, F., Toral, F., Torbin, I., Trapp, A., Treyer, D., Trowitzsch, G., Trublet, T., Tschentscher, T., Ullrich, F., Vannoni, M., Varela, P., Varghese, G., Vashchenko, G., Vasic, M., Vazquez-Velez, C., Verguet, A., Vilcins-Czvitkovits, S., Villanueva, R., Visentin, B., Viti, M., Vogel, E., Volobuev, E., Wagner, R., Walker, N., Wamsat, T., Weddig, H., Weichert, G., Weise, H., Wenndorf, R., Werner, M., Wichmann, R., Wiebers, C., Wiencek, M., Wilksen, T., Will, I., Winkelmann, L., Winkowski, M., Wittenburg, K., Witzig, A., Wlk, P., Wohlenberg, T., Wojciechowski, M., Wolff-Fabris, F., Wrochna, G., Wrona, K., Yakopov, M., Yang, B., Yang, F., Yurkov, M., Zagorodnov, I., Zalden, P., Zavadtsev, A., Zavadtsev, D., Zhirnov, A., Zhukov, A., Ziemann, V., Zolotov, A., Zolotukhina, N., Zummack, F., and Zybin, D.

Published
2020
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17. Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon

Author

Ilchen, M., Hartmann, G., Gryzlova, E. V., Achner, A., Allaria, E., Beckmann, A., Braune, M., Buck, J., Callegari, C., Coffee, R. N., Cucini, R., Danailov, M., De Fanis, A., Demidovich, A., Ferrari, E., Finetti, P., Glaser, L., Knie, A., Lindahl, A. O., Plekan, O., Mahne, N., Mazza, T., Raimondi, L., Roussel, E., Scholz, F., Seltmann, J., Shevchuk, I., Svetina, C., Walter, P., Zangrando, M., Viefhaus, J., Grum-Grzhimailo, A. N., and Meyer, M.

Published
2018
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18. A localized view on molecular dissociation via electron-ion partial covariance

Author

Allum, F, Music, V, Inhester, L, Boll, R, Erk, B, Schmidt, P, Baumann, TM, Brenner, G, Burt, M, Demekhin, PV, Dörner, S, Ehresmann, A, Galler, A, Grychtol, P, Heathcote, D, Kargin, D, Larsson, M, Lee, JWL, Li, Z, Manschwetus, B, Marder, L, Mason, R, Meyer, M, Otto, H, Passow, C, Pietschnig, R, Ramm, D, Schubert, K, Schwob, L, Thomas, RD, Vallance, C, Vidanović, I, von Korff Schmising, C, Wagner, R, Walter, P, Zhaunerchyk, V, Rolles, D, Bari, S, Brouard, M, and Ilchen, M

Subjects
ddc:540
Abstract

Communications chemistry 5(1), 42 (2022). doi:10.1038/s42004-022-00656-w, Inner-shell photoelectron spectroscopy provides an element-specific probe of molecular structure, as core-electron binding energies are sensitive to the chemical environment. Short-wavelength femtosecond light sources, such as Free-Electron Lasers (FELs), even enable time-resolved site-specific investigations of molecular photochemistry. Here, we study the ultraviolet photodissociation of chiral (R/S)-1-iodo-2-methylbutane, probed by XUV pulses from the Free-electron LASer in Hamburg (FLASH) through the ultrafast evolution of the iodine 4d binding energy. Methodologically, we introduce electron-ion partial covariance imaging as a technique to isolate otherwise elusive features in a two-dimensional photoelectron spectrum arising from different photofragmentation pathways. The experimental and theoretical results for the time-resolved electron spectra of the 4d$_{3/2}$ and 4d$_{5/2}$ atomic and molecular levels that are disentangled by this method provide a key step towards studying structural and chemical changes from a specific spectator site. We thus pave the way for approaching femto-stereochemistry with FELs., Published by Macmillan Publishers Limited, part of Springer Nature, [London]

Published
2022

19. Resonance-enhanced x-ray multiple ionization of a polyatomic molecule

Author

Li, X., primary, Rudenko, A., additional, Mazza, T., additional, Rörig, A., additional, Anders, N., additional, Baumann, Th. M., additional, Eckart, S., additional, Erk, B., additional, De Fanis, A., additional, Fehre, K., additional, Dörner, R., additional, Foucar, L., additional, Grundmann, S., additional, Grychtol, P., additional, Hartung, A., additional, Hofmann, M., additional, Ilchen, M., additional, Janke, Ch., additional, Kastirke, G., additional, Kircher, M., additional, Kubicek, K., additional, Kunitski, M., additional, Meister, S., additional, Melzer, N., additional, Montano, J., additional, Music, V., additional, Nalin, G., additional, Ovcharenko, Y., additional, Passow, Ch., additional, Pier, A., additional, Rennhack, N., additional, Rist, J., additional, Rivas, D. E., additional, Schlichting, I., additional, Schmidt, L. Ph. H., additional, Schmidt, Ph., additional, Schöffler, M. S., additional, Siebert, J., additional, Strenger, N., additional, Trabert, D., additional, Trinter, F., additional, Vela-Perez, I., additional, Wagner, R., additional, Walter, P., additional, Weller, M., additional, Ziolkowski, P., additional, Czasch, A., additional, Meyer, M., additional, Jahnke, T., additional, Rolles, D., additional, and Boll, R., additional

Published
2022
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20. Erratum: Emitter-site-selective photoelectron circular dichroism of trifluoromethyloxirane [Phys. Rev. A 95 , 053423 (2017)]

Author

Ilchen, M., primary, Hartmann, G., additional, Rupprecht, P., additional, Artemyev, A. N., additional, Coffee, R. N., additional, Li, Z., additional, Ohldag, H., additional, Ogasawara, H., additional, Osipov, T., additional, Ray, D., additional, Schmidt, Ph., additional, Wolf, T. J. A., additional, Ehresmann, A., additional, Moeller, S., additional, Knie, A., additional, and Demekhin, Ph. V., additional

Published
2022
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21. Coulomb explosion imaging of small polyatomic molecules with ultrashort x-ray pulses

Author

Li, X., primary, Rudenko, A., additional, Schöffler, M. S., additional, Anders, N., additional, Baumann, Th. M., additional, Eckart, S., additional, Erk, B., additional, De Fanis, A., additional, Fehre, K., additional, Dörner, R., additional, Foucar, L., additional, Grundmann, S., additional, Grychtol, P., additional, Hartung, A., additional, Hofmann, M., additional, Ilchen, M., additional, Janke, Ch., additional, Kastirke, G., additional, Kircher, M., additional, Kubicek, K., additional, Kunitski, M., additional, Mazza, T., additional, Meister, S., additional, Melzer, N., additional, Montano, J., additional, Music, V., additional, Nalin, G., additional, Ovcharenko, Y., additional, Passow, Ch., additional, Pier, A., additional, Rennhack, N., additional, Rist, J., additional, Rivas, D. E., additional, Schlichting, I., additional, Schmidt, L. Ph. H., additional, Schmidt, Ph., additional, Siebert, J., additional, Strenger, N., additional, Trabert, D., additional, Trinter, F., additional, Vela-Perez, I., additional, Wagner, R., additional, Walter, P., additional, Weller, M., additional, Ziolkowski, P., additional, Czasch, A., additional, Rolles, D., additional, Meyer, M., additional, Jahnke, T., additional, and Boll, R., additional

Published
2022
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23. Stimulated X-Ray Raman Scattering with Free-Electron Laser Sources

Author

Rohringer, N., primary, Kimberg, V., additional, Weninger, C., additional, Sanchez-Gonzalez, A., additional, Lutman, A., additional, Maxwell, T., additional, Bostedt, C., additional, Carron Monterro, S., additional, Lindahl, A. O., additional, Ilchen, M., additional, Coffee, R. N., additional, Bozek, J. D., additional, Krzywinski, J., additional, Kierspel, T., additional, Mullins, T., additional, Küpper, J., additional, Erk, B., additional, Rolles, D., additional, Mücke, O. D., additional, London, R. A., additional, Purvis, M., additional, Ryan, D., additional, Rocca, J. J., additional, Feifel, R., additional, Squibb, R., additional, Zhaunerchyk, V., additional, Såthe, C., additional, Agåker, M., additional, Mucke, M., additional, Nordgren, J., additional, and Rubensson, J. E., additional

Published
2015
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24. Site specific interrogation of an ionic chiral fragment during photolysis using an X ray free electron laser

Author

Ilchen, M., Schmidt, P., Novikovskiy, N.M., Hartmann, G., Rupprecht, P., Coffee, R.N., Ehresmann, A., Galler, A., Hartmann, N., Helml, W., Huang, Z., Inhester, L., Lutman, A.A., MacArthur, J.P., Maxwell, T., Meyer, M., Music, V., Nuhn, H.D., Osipov, T., Ray, D., Wolf, T.J.A., Bari, S., Walter, P., Li, Z., Moeller, S., Knie, A., and Demekhin, P.V.

Subjects
no topic specified
Abstract

Ultrashort circularly polarised light pulses from free electron lasers offer a route for exploring chiral molecules and their dynamics, but remain challenging to harness. Here, X ray pump probe experiments enable a site specific photoelectron circular dichroism measurement on a dissociating chiral molecule. Short wavelength free electron lasers with their ultrashort pulses at high intensities have originated new approaches for tracking molecular dynamics from the vista of specific sites. X ray pump X ray probe schemes even allow to address individual atomic constituents with a trigger event that preludes the subsequent molecular dynamics while being able to selectively probe the evolving structure with a time delayed second X ray pulse. Here, we use a linearly polarized X ray photon to trigger the photolysis of a prototypical chiral molecule, namely trifluoromethyloxirane C3H3F3O , at the fluorine K edge at around 700 eV. The created fluorine containing fragments are then probed by a second, circularly polarized X ray pulse of higher photon energy in order to investigate the chemically shifted inner shell electrons of the ionic mother fragment for their stereochemical sensitivity. We experimentally demonstrate and theoretically support how two color X ray pump X ray probe experiments with polarization control enable XFELs as tools for chiral recognition

Published
2021

25. Inner-Shell-Ionization-Induced Femtosecond Structural Dynamics of Water Molecules Imaged at an X-Ray Free-Electron Laser

Author

Jahnke, T., Guillemin, R., Inhester, L., Son, S-K, Kastirke, G., Ilchen, M., Rist, J., Trabert, D., Melzer, N., Anders, N., Mazza, T., Boll, R., De Fanis, A., Music, V, Weber, Th, Weller, M., Eckart, S., Fehre, K., Grundmann, S., Hartung, A., Hofmann, M., Janke, C., Kircher, M., Nalin, G., Pier, A., Siebert, J., Strenger, N., Vela-Perez, I, Baumann, T. M., Grychtol, P., Montano, J., Ovcharenko, Y., Rennhack, N., Rivas, D. E., Wagner, R., Ziolkowski, P., Schmidt, P., Marchenko, T., Travnikova, O., Journel, L., Ismail, I., Kukk, E., Niskanen, J., Trinter, F., Vozzi, C., Devetta, M., Stagira, S., Gisselbrecht, M., Jaeger, A. L., Li, X., Malakar, Y., Martins, M., Feifel, R., Schmidt, L. Ph H., Czasch, A., Sansone, G., Rolles, D., Rudenko, A., Moshammer, R., Doerner, R., Meyer, M., Pfeifer, T., Schoeffler, M. S., Santra, R., Simon, M., Piancastelli, Maria Novella, Jahnke, T., Guillemin, R., Inhester, L., Son, S-K, Kastirke, G., Ilchen, M., Rist, J., Trabert, D., Melzer, N., Anders, N., Mazza, T., Boll, R., De Fanis, A., Music, V, Weber, Th, Weller, M., Eckart, S., Fehre, K., Grundmann, S., Hartung, A., Hofmann, M., Janke, C., Kircher, M., Nalin, G., Pier, A., Siebert, J., Strenger, N., Vela-Perez, I, Baumann, T. M., Grychtol, P., Montano, J., Ovcharenko, Y., Rennhack, N., Rivas, D. E., Wagner, R., Ziolkowski, P., Schmidt, P., Marchenko, T., Travnikova, O., Journel, L., Ismail, I., Kukk, E., Niskanen, J., Trinter, F., Vozzi, C., Devetta, M., Stagira, S., Gisselbrecht, M., Jaeger, A. L., Li, X., Malakar, Y., Martins, M., Feifel, R., Schmidt, L. Ph H., Czasch, A., Sansone, G., Rolles, D., Rudenko, A., Moshammer, R., Doerner, R., Meyer, M., Pfeifer, T., Schoeffler, M. S., Santra, R., Simon, M., and Piancastelli, Maria Novella

Abstract

The ultrafast structural dynamics of water following inner-shell ionization is a crucial issue in high-energy radiation chemistry. We have exposed isolated water molecules to a short x-ray pulse from a free-electron laser and detected momenta of all produced ions in coincidence. By combining experimental results and theoretical modeling, we can image dissociation dynamics of individual molecules in unprecedented detail. We reveal significant molecular structural dynamics in H2O2+, such as asymmetric deformation and bond-angle opening, leading to two-body or three-body fragmentation on a timescale of a few femtoseconds. We thus reconstruct several snapshots of structural dynamics at different time intervals, which highlight dynamical patterns that are relevant as initiating steps of subsequent radiation-damage processes.

Published
2021
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26. Photon-recoil imaging : Expanding the view of nonlinear x-ray physics

Author

Eichmann, U., Rottke, H., Meise, S., Rubensson, Jan-Erik, Söderström, Johan, Agåker, Marcus, Såthe, C., Meyer, M., Baumann, T. M., Boll, R., De Fanis, A., Grychtol, P., Mazza, T., Montano, J., Music, V, Ovcharenko, Y., Rivas, D. E., Serkez, S., Wagner, R., Eisebitt, S., Ilchen, M., Eichmann, U., Rottke, H., Meise, S., Rubensson, Jan-Erik, Söderström, Johan, Agåker, Marcus, Såthe, C., Meyer, M., Baumann, T. M., Boll, R., De Fanis, A., Grychtol, P., Mazza, T., Montano, J., Music, V, Ovcharenko, Y., Rivas, D. E., Serkez, S., Wagner, R., Eisebitt, S., and Ilchen, M.

Abstract

Addressing the ultrafast coherent evolution of electronic wave functions has long been a goal of nonlinear x-ray physics. A first step toward this goal is the investigation of stimulated x-ray Raman scattering (SXRS) using intense pulses from an x-ray free-electron laser. Earlier SXRS experiments relied on signal amplification during pulse propagation through dense resonant media. By contrast, our method reveals the fundamental process in which photons from the primary radiation source directly interact with a single atom. We introduce an experimental protocol in which scattered neutral atoms rather than scattered photons are detected. We present SXRS measurements at the neon K edge and a quantitative theoretical analysis. The method should become a powerful tool in the exploration of nonlinear x-ray physics.

Published
2020
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27. Mapping Resonance Structures in Transient Core-Ionized Atoms

Author

Mazza, T., primary, Ilchen, M., additional, Kiselev, M. D., additional, Gryzlova, E. V., additional, Baumann, T. M., additional, Boll, R., additional, De Fanis, A., additional, Grychtol, P., additional, Montaño, J., additional, Music, V., additional, Ovcharenko, Y., additional, Rennhack, N., additional, Rivas, D. E., additional, Schmidt, Ph., additional, Wagner, R., additional, Ziolkowski, P., additional, Berrah, N., additional, Erk, B., additional, Johnsson, P., additional, Küstner-Wetekam, C., additional, Marder, L., additional, Martins, M., additional, Ott, C., additional, Pathak, S., additional, Pfeifer, T., additional, Rolles, D., additional, Zatsarinny, O., additional, Grum-Grzhimailo, A. N., additional, and Meyer, M., additional

Published
2020
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28. Photon-recoil imaging: Expanding the view of nonlinear x-ray physics

Author

Eichmann, U., primary, Rottke, H., additional, Meise, S., additional, Rubensson, J.-E., additional, Söderström, J., additional, Agåker, M., additional, Såthe, C., additional, Meyer, M., additional, Baumann, T. M., additional, Boll, R., additional, De Fanis, A., additional, Grychtol, P., additional, Ilchen, M., additional, Mazza, T., additional, Montano, J., additional, Music, V., additional, Ovcharenko, Y., additional, Rivas, D. E., additional, Serkez, S., additional, Wagner, R., additional, and Eisebitt, S., additional

Published
2020
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29. Ultrafast Structural Changes in Chiral Molecules Measured with Free-Electron Lasers

Author

Schmidt, P, primary, Music, V, additional, Hartmann, G, additional, Boll, R, additional, Erk, B, additional, Bari, S, additional, Allum, F, additional, Baumann, T M, additional, Brenner, G, additional, Brouard, M, additional, Burt, M, additional, Coffee, R, additional, Dörner, S, additional, Galler, A, additional, Grychtol, P, additional, Heathcote, D, additional, Inhester, L, additional, Kazemi, M, additional, Larsson, M, additional, Lee, J, additional, Li, Z, additional, Lutmann, A, additional, Manschwetus, B, additional, Marder, L, additional, Mason, R, additional, Moeller, S, additional, Osipov, T, additional, Otto, H, additional, Passow, C, additional, Rolles, D, additional, Rupprecht, P, additional, Schubert, K, additional, Schwob, L, additional, Thomas, R, additional, Vallance, C, additional, von Korff Schmising, C, additional, Wagner, R, additional, Walter, P, additional, Wolf, T J A, additional, Zhaunerchyk, V, additional, Meyer, M, additional, Ehresmann, A, additional, Knie, A, additional, Demekhin, Ph V, additional, and Ilchen, M, additional

Published
2020
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30. The Small Quantum System (SQS) Instrument at European XFEL: Results of commissioning and first experiments

Author

Meyer, M, primary, Baumann, T M, additional, Achner, A, additional, Boll, R, additional, De Fanis, A, additional, Grychtol, P, additional, Ilchen, M, additional, Mazza, T, additional, Montaño, J, additional, Music, V, additional, Ovcharenko, Y, additional, Rennhack, N, additional, Rivas, D E, additional, Wagner, R, additional, Ziołkowski, P, additional, Rolles, D, additional, Walter, P, additional, Erk, B, additional, Keitel, B, additional, Plönjes, E, additional, Mann, K, additional, Lange, S, additional, Schäfer, B, additional, Chalupský, J, additional, Burian, T, additional, Juranova, K, additional, Vyšín, L, additional, Hájková, V, additional, and Juha, L, additional

Published
2020
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31. X-ray spectroscopy on ultrafast-decaying core-excited atomic ions

Author

Ilchen, M, primary, Mazza, T, additional, Baumann, T M, additional, Boll, R, additional, De Fanis, A, additional, Grychtol, P, additional, Music, V, additional, Ovcharenko, Y, additional, Rivas, D, additional, Berrah, N, additional, Erk, B, additional, Gryzlova, E, additional, Johnsson, P, additional, Küstner-Wetekam, C, additional, Marder, L, additional, Martins, M, additional, Ott, Ch, additional, Pathak, S, additional, Pfeifer, Th, additional, Rolles, D, additional, Schmidt, P, additional, Grum-Grzhimailo, A, additional, and Meyer, M, additional

Published
2020
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32. New Science Opportunities Enabled by LCLS-II X-Ray Lasers

Author

Abbamonte, P., primary, Abild-Pedersen, Frank, additional, Adams, P., additional, Ahmed, M., additional, Albert, F., additional, Mori, R., additional, Anfinrud, P., additional, Aquila, A., additional, Armstrong, M., additional, Arthur, J., additional, Bargar, J., additional, Barty, A., additional, Bergmann, U., additional, Berrah, N., additional, Blaj, G., additional, Bluhm, H., additional, Bolme, C., additional, Bostedt, C., additional, Boutet, S., additional, Brown, G., additional, Bucksbaum, P., additional, Cargnello, M., additional, Carini, G., additional, Cavalleri, A., additional, Cherezov, V., additional, Chiu, W., additional, Chuang, Y., additional, Cocco, D., additional, Coffee, R., additional, Collins, G., additional, Cordones-Hahn, A., additional, Cryan, J., additional, Dakovski, G., additional, Dantus, M., additional, Demirci, H., additional, Denes, P., additional, Devereaux, T., additional, Ding, Y., additional, Doniach, S., additional, Dorner, R., additional, Dunne, M., additional, Durr, H., additional, Egami, T., additional, Eisenberg, D., additional, Emma, P., additional, Fadley, C., additional, Falcone, R., additional, Feng, Y., additional, Fischer, P., additional, Fiuza, F., additional, Fletcher, L., additional, Foucar, L., additional, Frank, M., additional, Fraser, J., additional, Frei, H., additional, Fritz, D., additional, Fromme, P., additional, Fry, A., additional, Fuchs, M., additional, Fuoss, P., additional, Gaffney, K., additional, Gamboa, E., additional, Gessner, O., additional, Ghimire, S., additional, Gleason, A., additional, Glenzer, S., additional, Gorkhover, T., additional, Gray, A., additional, Guehr, M., additional, Guo, J., additional, Hajdu, J., additional, Hansen, S., additional, Hart, P., additional, Hashimoto, M., additional, Hastings, J., additional, Haxton, D., additional, Heimann, P., additional, Heinz, T., additional, Hexemer, A., additional, Hill, J., additional, Himpsel, F., additional, Ho, P., additional, Hogue, B., additional, Huang, Z., additional, Hunter, M., additional, Hura, G., additional, Huse, N., additional, Hussain, Z., additional, Ilchen, M., additional, Jacobsen, C., additional, Kenney, C., additional, Kern, J., additional, Kevan, S., additional, Kim, J., additional, Kim, H., additional, Kirchmann, P., additional, Kirian, R., additional, Kivelson, S., additional, Kliewer, C., additional, Koralek, J., additional, Kovacsova, G., additional, Lanzara, A., additional, LaRue, J., additional, Lee, H., additional, Lee, J., additional, Lee, W., additional, Lee, Y., additional, Lindau, I., additional, Lindenberg, A., additional, Liu, Z., additional, Lu, D., additional, Lundstrom, U., additional, MacDowell, A., additional, Mao, W., additional, Marangos, J., additional, Marcus, G., additional, Martinez, T., additional, McCurdy, W., additional, McDermott, G., additional, McGuffey, C., additional, Minitti, M., additional, Miyabe, S., additional, Moeller, S., additional, Moore, R., additional, Mukamel, S., additional, Nass, K., additional, Natan, A., additional, Nelson, K., additional, Nemsak, S., additional, Neumark, D., additional, Neutze, R., additional, Nilsson, A., additional, Nordlund, D., additional, Norskov, J., additional, Nozawa, S., additional, Ogasawara, H., additional, Ohldag, H., additional, Orville, A., additional, Osborn, D., additional, Osipov, T., additional, Ourmazd, A., additional, Parkinson, D., additional, Pellegrini, C., additional, Phillips, G., additional, Rasing, T., additional, Raubenheimer, T., additional, Recigno, T., additional, Reid, A., additional, Reis, D., additional, Robert, A., additional, Robinson, J., additional, Rolles, D., additional, Rost, J., additional, Roy, S., additional, Rudenko, A., additional, Russell, T., additional, Sandberg, R., additional, Sandhu, A., additional, Sauter, N., additional, Schlichting, I., additional, Schlogl, R., additional, Schlotter, W., additional, Schmidt, M., additional, Schneider, J., additional, Schoenlein, R., additional, Schoeffler, M., additional, Scholl, A., additional, Shen, Z., additional, Shpyrko, O., additional, Silva, T., additional, Sinha, S., additional, Slaughter, D., additional, Sobota, J., additional, Sokaras, D., additional, Sokolowski-Tinten, K., additional, Southworth, S., additional, Spence, J., additional, Stan, C., additional, Stohr, J., additional, Stroud, R., additional, Sundstrom, V., additional, Taatjes, C., additional, Thomas, A., additional, Trigo, M., additional, Tsui, Y., additional, Turner, J., additional, van Buuren, A., additional, Vinko, S., additional, Wakatsuki, S., additional, Wark, J., additional, Weber, P., additional, Weber, T., additional, Wei, M., additional, Weiss, T., additional, Wernet, P., additional, White, W., additional, Willmott, P., additional, Wilson, K., additional, Wurth, W., additional, Yachandra, V., additional, Yano, J., additional, Yarotski, D., additional, Young, L., additional, Zhu, Y., additional, Zhu, D., additional, and Zwart, P., additional

Published
2015
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33. Two-color XUV plus NIR femtosecond photoionization of neon in the near-threshold region

Author

Duesterer, S., Hartmann, G., Bomme, C., Boll, R., Costello, J. T., Erk, B., De Fanis, A., Ilchen, M., Johnsson, P., Kelly, T. J., Manschwetus, B., Mazza, T., Meyer, M., Passow, C., Rompotis, D., Varvarezos, L., Kazansky, Andrey K., and Kabachnik, N. M.

Subjects
atomic photoionization, multiphoton two-color interaction, free-electron laser, photoelectron spectroscopy, ionization, flash, free-electron laser interactions, theoretical description, field, pulse, photoelectron
Abstract

Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms by combined femtosecond extreme ultraviolet and near infrared fields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by the photon energy of the dressing laser. Surprisingly, for the low kinetic energy (few eV) sidebands, the photoelectron energy varies as a function of the emission angle. Such behavior has not yet been observed in sideband creation and has not been predicted in commonly used theoretical descriptions such as strong field approximation and soft photon approach. Describing the photoionization with a time-dependent Schrodinger equation allows a qualitative description of the observed effect, as well as the prediction of fine structure in the sideband distribution. We want to acknowledge the work of the scientific and technical team at FLASH. We acknowledge the Max Planck Society for funding the development and the initial operation of the CAMP endstation within the Max Planck Advanced Study Group at CFEL and for providing this equipment for CAMP@FLASH. The installation of CAMP@FLASH was partially funded by the BMBF grants 05K10KT2, 05K13KT2, 05K16KT3 and 05K10KTB from FSP-302. NMK acknowledges hospitality and financial support from FS-DESY and from the theory group in cooperation with the SQS work package of European XFEL (Hamburg). The participation of the DCU group was made possible by Science Foundation Ireland grant nos. 12/IA/1742 and 16/RI/3696. PJ acknowledges support from the Swedish Research Council and the Swedish Foundation for Strategic Research. MI acknowledges funding by the Volkswagen Foundation within a Peter Paul Ewald-Fellowship. AKK acknowledges the support of the Spanish Ministerio de Economia y Competitividad (grants FIS2016-76617-P and FIS2016-76471-P).

Published
2019

34. Two-color XUV plus NIR femtosecond photoionization of neon in the near-threshold region

Author

Física de materiales, Materialen fisika, Duesterer, S., Hartmann, G., Bomme, C., Boll, R., Costello, J. T., Erk, B., De Fanis, A., Ilchen, M., Johnsson, P., Kelly, T. J., Manschwetus, B., Mazza, T., Meyer, M., Passow, C., Rompotis, D., Varvarezos, L., Kazansky, Andrey K., Kabachnik, N. M., Física de materiales, Materialen fisika, Duesterer, S., Hartmann, G., Bomme, C., Boll, R., Costello, J. T., Erk, B., De Fanis, A., Ilchen, M., Johnsson, P., Kelly, T. J., Manschwetus, B., Mazza, T., Meyer, M., Passow, C., Rompotis, D., Varvarezos, L., Kazansky, Andrey K., and Kabachnik, N. M.

Abstract

Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms by combined femtosecond extreme ultraviolet and near infrared fields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by the photon energy of the dressing laser. Surprisingly, for the low kinetic energy (few eV) sidebands, the photoelectron energy varies as a function of the emission angle. Such behavior has not yet been observed in sideband creation and has not been predicted in commonly used theoretical descriptions such as strong field approximation and soft photon approach. Describing the photoionization with a time-dependent Schrodinger equation allows a qualitative description of the observed effect, as well as the prediction of fine structure in the sideband distribution.

Published
2019

35. Megahertz-compatible angular streaking with few-femtosecond resolution at x-ray free-electron lasers

Author

Heider, R., primary, Wagner, M. S., additional, Hartmann, N., additional, Ilchen, M., additional, Buck, J., additional, Hartmann, G., additional, Shirvanyan, V., additional, Lindahl, A. O., additional, Grünert, J., additional, Krzywinski, J., additional, Liu, J., additional, Ossiander, M., additional, Lutman, A. A., additional, Maxwell, T., additional, Miahnahri, A. A., additional, Moeller, S. P., additional, Planas, M., additional, Robinson, J., additional, Viefhaus, J., additional, Feurer, T., additional, Kienberger, R., additional, Coffee, R. N., additional, and Helml, W., additional

Published
2019
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37. Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region

Author

Düsterer, S, primary, Hartmann, G, additional, Bomme, C, additional, Boll, R, additional, Costello, J T, additional, Erk, B, additional, De Fanis, A, additional, Ilchen, M, additional, Johnsson, P, additional, Kelly, T J, additional, Manschwetus, B, additional, Mazza, T, additional, Meyer, M, additional, Passow, C, additional, Rompotis, D, additional, Varvarezos, L, additional, Kazansky, A K, additional, and Kabachnik, N M, additional

Published
2019
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38. Femtosecond profiling of shaped x-ray pulses

Author

Hoffmann, M C, primary, Grguraš, I, additional, Behrens, C, additional, Bostedt, C, additional, Bozek, J, additional, Bromberger, H, additional, Coffee, R, additional, Costello, J T, additional, DiMauro, L F, additional, Ding, Y, additional, Doumy, G, additional, Helml, W, additional, Ilchen, M, additional, Kienberger, R, additional, Lee, S, additional, Maier, A R, additional, Mazza, T, additional, Meyer, M, additional, Messerschmidt, M, additional, Schorb, S, additional, Schweinberger, W, additional, Zhang, K, additional, and Cavalieri, A L, additional

Published
2018
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39. Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning

Author

Sanchez-Gonzalez, A., Micaelli, P., Olivier, C., Barillot, T. R., Ilchen, M., Lutman, A. A., Marinelli, A., Maxwell, T., Achner, A., Agåker, M., Berrah, N., Bostedt, C., Bozek, J. D., Buck, J., Bucksbaum, P. H., Montero, S. Carron, Cooper, B., Cryan, J. P., Dong, M., Feifel, R., Frasinski, L. J., Fukuzawa, H., Galler, A., Hartmann, G., Hartmann, N., Helml, W., Johnson, A. S., Knie, A., Lindahl, A. O., Liu, J., Motomura, K., Mucke, M., O'Grady, C., Rubensson, J-E., Simpson, E. R., Squibb, R. J., Sathe, C., Ueda, K., Vacher, M., Walke, D. J., Zhaunerchyk, V., Coffee, R. N., Marangos, J. P., Sanchez-Gonzalez, A., Micaelli, P., Olivier, C., Barillot, T. R., Ilchen, M., Lutman, A. A., Marinelli, A., Maxwell, T., Achner, A., Agåker, M., Berrah, N., Bostedt, C., Bozek, J. D., Buck, J., Bucksbaum, P. H., Montero, S. Carron, Cooper, B., Cryan, J. P., Dong, M., Feifel, R., Frasinski, L. J., Fukuzawa, H., Galler, A., Hartmann, G., Hartmann, N., Helml, W., Johnson, A. S., Knie, A., Lindahl, A. O., Liu, J., Motomura, K., Mucke, M., O'Grady, C., Rubensson, J-E., Simpson, E. R., Squibb, R. J., Sathe, C., Ueda, K., Vacher, M., Walke, D. J., Zhaunerchyk, V., Coffee, R. N., and Marangos, J. P.

Abstract

Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this potential, we must accurately know the X-ray properties: intensity, spectrum and temporal profile. Owing to the inherent fluctuations in free-electron lasers, this mandates a full characterization of the properties for each and every pulse. While diagnostics of these properties exist, they are often invasive and many cannot operate at a high-repetition rate. Here, we present a technique for circumventing this limitation. Employing a machine learning strategy, we can accurately predict X-ray properties for every shot using only parameters that are easily recorded at high-repetition rate, by training a model on a small set of fully diagnosed pulses. This opens the door to fully realizing the promise of next-generation high-repetition rate X-ray lasers.

Published
2017
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40. Angle resolved photoelectron spectroscopy of two-color XUV-NIR ionization with polarization control

Author

Düsterer, S., Hartmann, G., Babies, F., Beckmann, A., Brenner, G., Buck, J., Costello, C., Dammann, L., Fanis, A., Geßler, P., Glaser, L., Ilchen, M., Johnsson, P., Kazansky, A., Kelly, T., Mazza, T., Meyer, M., Nosik, V., Sazhina, I., Scholz, F., Seltmann, J., Sotoudi, H., Viefhaus, J., and Kabachnik, N.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Electron emission caused by extreme ultraviolet (XUV) radiation in the presence of a strong near infrared (NIR) field leads to multiphoton interactions that depend on several parameters. Here, a comprehensive study of the influence of the angle between the polarization directions of the NIR and XUV fields on the two-color angle-resolved photoelectron spectra of He and Ne is presented. The resulting photoelectron angular distribution strongly depends on the orientation of the NIR polarization plane with respect to that of the XUV field. The prevailing influence of the intense NIR field over the angular emission characteristics for He(1s) and Ne(2p) ionization lines is shown. The underlying processes are modeled in the frame of the strong field approximation (SFA) which shows very consistent agreement with the experiment reaffirming the power of the SFA for multicolor-multiphoton ionization in this regime.

Published
2016

41. Circular Dichroism in the Multi-Photon Ionization of Oriented Helium Ions

Author

Ilchen, M., primary, Douguet, N., additional, Mazza, T., additional, Rafipoor, A. J., additional, Callegari, C., additional, Finetti, P., additional, Plekan, O., additional, Prince, K. C., additional, Demidovich, A., additional, Grazioli, C., additional, Avaldi, L., additional, Bolognesi, P., additional, Coreno, M., additional, Di Fraia, M., additional, Devetta, M., additional, Ovcharenko, Y., additional, Düsterer, S., additional, Ueda, K., additional, Bartschat, K., additional, Grum-Grzhimailo, A. N., additional, Bozhevolnov, A. V., additional, Kazansky, A. K., additional, Kabachnik, N. M., additional, and Meyer, M., additional

Published
2017
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42. Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning

Author

Sanchez-Gonzalez, A., primary, Micaelli, P., additional, Olivier, C., additional, Barillot, T. R., additional, Ilchen, M., additional, Lutman, A. A., additional, Marinelli, A., additional, Maxwell, T., additional, Achner, A., additional, Agåker, M., additional, Berrah, N., additional, Bostedt, C., additional, Bozek, J. D., additional, Buck, J., additional, Bucksbaum, P. H., additional, Montero, S. Carron, additional, Cooper, B., additional, Cryan, J. P., additional, Dong, M., additional, Feifel, R., additional, Frasinski, L. J., additional, Fukuzawa, H., additional, Galler, A., additional, Hartmann, G., additional, Hartmann, N., additional, Helml, W., additional, Johnson, A. S., additional, Knie, A., additional, Lindahl, A. O., additional, Liu, J., additional, Motomura, K., additional, Mucke, M., additional, O’Grady, C., additional, Rubensson, J-E, additional, Simpson, E. R., additional, Squibb, R. J., additional, Såthe, C., additional, Ueda, K., additional, Vacher, M., additional, Walke, D. J., additional, Zhaunerchyk, V., additional, Coffee, R. N., additional, and Marangos, J. P., additional

Published
2017
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43. Emitter-site-selective photoelectron circular dichroism of trifluoromethyloxirane

Author

Ilchen, M., primary, Hartmann, G., additional, Rupprecht, P., additional, Artemyev, A. N., additional, Coffee, R. N., additional, Li, Z., additional, Ohldag, H., additional, Ogasawara, H., additional, Osipov, T., additional, Ray, D., additional, Schmidt, Ph., additional, Wolf, T. J. A., additional, Ehresmann, A., additional, Moeller, S., additional, Knie, A., additional, and Demekhin, Ph. V., additional

Published
2017
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44. Circular Dichroism in Multiphoton Ionization of Resonantly ExcitedHe+Ions

Author

Ilchen, M., primary, Douguet, N., additional, Mazza, T., additional, Rafipoor, A. J., additional, Callegari, C., additional, Finetti, P., additional, Plekan, O., additional, Prince, K. C., additional, Demidovich, A., additional, Grazioli, C., additional, Avaldi, L., additional, Bolognesi, P., additional, Coreno, M., additional, Di Fraia, M., additional, Devetta, M., additional, Ovcharenko, Y., additional, Düsterer, S., additional, Ueda, K., additional, Bartschat, K., additional, Grum-Grzhimailo, A. N., additional, Bozhevolnov, A. V., additional, Kazansky, A. K., additional, Kabachnik, N. M., additional, and Meyer, M., additional

Published
2017
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45. Angle-resolved study of resonant Auger decay and fluorescence emission processes after core excitations of the terminal and central nitrogen atoms in ${\mathrm{N}}_{2}\mathrm{O}$

Author

Knie, A., Ilchen, M., Schmidt, Ph., Reiß, Ph., Ozga, C., Kambs, B., Hans, A., Müglich, N., Galitskiy, S. A., Glaser, L., Walter, P., Viefhaus, J., Ehresmann, A., and Demekhin, Ph. V.

Subjects
Physics::Atomic and Molecular Clusters, ddc:530
Abstract

Physical review / A 90(1), 013416 (2014). doi:10.1103/PhysRevA.90.013416, Angular distributions of the N2O+(X) and N2O+(A) photoelectrons were measured as functions of the exciting-photon energy with small bandwidth in the vicinity of the resonant Nt(1s→π∗), Nt(1s→σ∗), and Nc(1s→π∗) core excitations of N2O. For selected exciting-photon energies in this range, angular distribution parameters of the N2O+(A→X) fluorescence were also determined. These data are interpreted by ab initio calculations. Long-range exciting-photon energy dependencies of the photoelectron angular distribution parameters βeX(ω) and βeA(ω), recorded vibrationally unresolved, are attributed to an electronic state interference between the direct and the different resonant amplitudes for the population of the final ionic states. In addition to that, strong influence of lifetime vibrational interference is identified in the observed dispersion of the vibrationally resolved fluorescence angular distribution parameter β2XA(ω) across the electronic resonances., Published by APS, College Park, Md.

Published
2014

46. Angle resolved photoelectron spectroscopy of two-color XUV–NIR ionization with polarization control

Author

Düsterer, S, primary, Hartmann, G, additional, Babies, F, additional, Beckmann, A, additional, Brenner, G, additional, Buck, J, additional, Costello, J, additional, Dammann, L, additional, Fanis, A De, additional, Geßler, P, additional, Glaser, L, additional, Ilchen, M, additional, Johnsson, P, additional, Kazansky, A K, additional, Kelly, T J, additional, Mazza, T, additional, Meyer, M, additional, Nosik, V L, additional, Sazhina, I P, additional, Scholz, F, additional, Seltmann, J, additional, Sotoudi, H, additional, Viefhaus, J, additional, and Kabachnik, N M, additional

Published
2016
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47. Circular dichroism measurements at an x-ray free-electron laser with polarization control

Author

Hartmann, G., primary, Lindahl, A. O., additional, Knie, A., additional, Hartmann, N., additional, Lutman, A. A., additional, MacArthur, J. P., additional, Shevchuk, I., additional, Buck, J., additional, Galler, A., additional, Glownia, J. M., additional, Helml, W., additional, Huang, Z., additional, Kabachnik, N. M., additional, Kazansky, A. K., additional, Liu, J., additional, Marinelli, A., additional, Mazza, T., additional, Nuhn, H.-D., additional, Walter, P., additional, Viefhaus, J., additional, Meyer, M., additional, Moeller, S., additional, Coffee, R. N., additional, and Ilchen, M., additional

Published
2016
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48. Two-electron processes in multiple ionization under strong soft-x-ray radiation

Author

Ilchen, M., primary, Mazza, T., additional, Karamatskos, E. T., additional, Markellos, D., additional, Bakhtiarzadeh, S., additional, Rafipoor, A. J., additional, Kelly, T. J., additional, Walsh, N., additional, Costello, J. T., additional, O'Keeffe, P., additional, Gerken, N., additional, Martins, M., additional, Lambropoulos, P., additional, and Meyer, M., additional

Published
2016
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49. Angular distribution and circular dichroism in the two-colour XUV+NIR above-threshold ionization of helium

Author

Mazza, T., primary, Ilchen, M., additional, Rafipoor, A.J., additional, Callegari, C., additional, Finetti, P., additional, Plekan, O., additional, Prince, K.C., additional, Richter, R., additional, Demidovich, A., additional, Grazioli, C., additional, Avaldi, L., additional, Bolognesi, P., additional, Coreno, M., additional, O’Keeffe, P., additional, Di Fraia, M., additional, Devetta, M., additional, Ovcharenko, Y., additional, Lyamayev, V., additional, Düsterer, S., additional, Ueda, K., additional, Costello, J.T., additional, Gryzlova, E.V., additional, Strakhova, S.I., additional, Grum-Grzhimailo, A.N., additional, Bozhevolnov, A.V., additional, Kazansky, A.K., additional, Kabachnik, N.M., additional, and Meyer, M., additional

Published
2016
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50. Auger Electron and Photoabsorption Spectra of Glycine in the Vicinity of the Oxygen K-edge Measured with an X-FEL

Author

Sanchez-Gonzalez, A., Barillot, T. R., Squibb, R. J., Kolorenc, P., Agåker, Marcus, Averbukh, V., Bearpark, M. J., Bostedt, C., Bozek, J. D., Bruce, S., Montero, S. Carron, Coffee, R. N., Cooper, B., Cryan, J. P., Dong, Minjie, Eland, J. H. D., Fang, L., Fukuzawa, H., Guehr, M., Ilchen, M., Johnsson, A. S., Liekhus-S, C., Marinelli, A., Maxwell, T., Motomura, K., Mucke, Melanie, Natan, A., Osipov, T., Östlin, Christofer, Pernpointner, M., Petrovic, V. S., Robb, M. A., Sathe, C., Simpson, E. R., Underwood, J. G., Vacher, Morgane, Walke, D. J., Wolf, T. J. A., Zhaunerchyk, V., Rubensson, Jan-Erik, Berrah, N., Bucksbaum, P. H., Ueda, K., Feifel, R., Frasinski, L. J., Marangos, J. P., Sanchez-Gonzalez, A., Barillot, T. R., Squibb, R. J., Kolorenc, P., Agåker, Marcus, Averbukh, V., Bearpark, M. J., Bostedt, C., Bozek, J. D., Bruce, S., Montero, S. Carron, Coffee, R. N., Cooper, B., Cryan, J. P., Dong, Minjie, Eland, J. H. D., Fang, L., Fukuzawa, H., Guehr, M., Ilchen, M., Johnsson, A. S., Liekhus-S, C., Marinelli, A., Maxwell, T., Motomura, K., Mucke, Melanie, Natan, A., Osipov, T., Östlin, Christofer, Pernpointner, M., Petrovic, V. S., Robb, M. A., Sathe, C., Simpson, E. R., Underwood, J. G., Vacher, Morgane, Walke, D. J., Wolf, T. J. A., Zhaunerchyk, V., Rubensson, Jan-Erik, Berrah, N., Bucksbaum, P. H., Ueda, K., Feifel, R., Frasinski, L. J., and Marangos, J. P.

Abstract

We report the first measurement of the near oxygen K-edge auger spectrum of the glycine molecule. Our work employed an x-ray free electron laser as the photon source operated with input photon energies tunable between 527 and 547 eV. Complete electron spectra were recorded at each photon energy in the tuning range, revealing resonant and non-resonant auger structures. Finally ab initio theoretical predictions are compared with the measured above the edge auger spectrum and an assignment of auger decay channels is performed.

Published
2015
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