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656 results on '"Stagira, S."'

2. Time-resolved chiral X-Ray photoelectron spectroscopy with transiently enhanced atomic site-selectivity: a Free Electron Laser investigation of electronically excited fenchone enantiomers

Author

Faccialà, D., Devetta, M., Beauvarlet, S., Besley, N., Calegari, F., Callegari, C., Catone, D., Cinquanta, E., Ciriolo, A. G., Colaizzi, L., Coreno, M., Crippa, G., De Ninno, G., Di Fraia, M., Galli, M., Garcia, G. A., Mairesse, Y., Negro, M., Plekan, O., Geetha, P. Prasannan, Prince, K. C., Pusala, A., Stagira, S., Turchini, S., Ueda, K., You, D., Zema, N., Blanchet, V., Nahon, L., Powis, I., and Vozzi, C.

Subjects
Physics - Chemical Physics
Abstract

Chiral molecules are widespread in nature, playing a fundamental role in bio-chemical processes and in the origin of life itself. The observation of dynamics in chiral molecules is crucial for the understanding and control of the chiral activity of photo-excited states. One of the most promising techniques for the study of photo-excited chiral systems is time-resolved photoelectron circular dichroism (TR-PECD), which offers an intense and sensitive probe for vibronic and geometric molecular structure as well as electronic structures, and their evolution on a femtosecond timescale. However, the non-local character of the PECD effect, which is imprinted during the electron scattering off the molecule, makes the interpretation of TR-PECD experiments challenging. In this respect, core-photoionization is known to allow site- and chemical-sensitivity to photelectron spectroscopy. Here we demonstrate that TR-PECD utilising core-level photoemission enables probing the chiral electronic structure and its relaxation dynamics with atomic site sensitivity. Following UV pumped excitation to a 3s Rydberg state, fenchone enantiomers (C 10 H 16 O) were probed on a femtosecond scale using circularly polarized soft X-ray light pulses provided by the free-electron laser FERMI. C 1s binding energy shifts caused by the redistribution of valence electron density in this 3s-valence-Rydberg excitation allowed us to measure transient PECD chiral responses with an enhanced C-atom site-selectivity compared to that achievable in the ground state molecule. These results represent the first chemical-specific and site-specific, enantio-sensitive observations on the electronic structure of a photo-excited chiral molecule and pave the way towards chiral femtochemistry probed by core-level photoemission.

Published
2022
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3. Modeling generation of harmonics in the water window region in hollow core waveguides by mid-infrared femtosecond pulses.

Author

Gherman, A. M. M., Tóth, I., Ciriolo, A. G., Martínez Vázquez, R., Nistico, A., Stagira, S., and Toşa, V.

Subjects
FEMTOSECOND pulses, NUMERICAL calculations, WAVEGUIDES, DIAMETER, ATOMS
Abstract

We numerically investigate generation of harmonics in the water window region (down to 2.8 nm) by 2 μ m femtosecond pulses propagating in hollow core waveguides filled with high pressure He. Numerical calculations are based on a three dimensional macroscopic model, which solves the pulse propagation by a split-step method, uses the strong field approximation to evaluate the single atom response, and integrates it coherently to obtain the harmonic field. Two configurations for the waveguides are considered: the standard one with a constant diameter of 70 μ m and a conical one with a decreasing diameter from 70 to 50 μ m. We demonstrate that harmonic field enhancement can be obtained in spectral domains of great practical interest, from 2.8 to 20 nm, and identify quasi-phase matching induced by multimode beating as the mechanism responsible for this enhancement. [ABSTRACT FROM AUTHOR]

Published
2024
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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

6. High-order harmonic spectroscopy for molecular imaging of polyatomic molecules

Author

Negro, M., Devetta, M., Faccialà, D., De Silvestri, S., Vozzi, C., and Stagira, S.

Subjects
Physics - Chemical Physics, Physics - Optics
Abstract

High-order harmonic generation is a powerful and sensitive tool for probing atomic and molecular structures, combining in the same measurement an unprecedented attosecond temporal resolution with a high spatial resolution, of the order of the angstrom. Imaging of the outermost molecular orbital by high-order harmonic generation has been limited for a long time to very simple molecules, like nitrogen. Recently we demonstrated a technique that overcame several of the issues that have prevented the extension of molecular orbital tomography to more complex species, showing that molecular imaging can be applied to a triatomic molecule like carbon dioxide. Here we report on the application of such technique to nitrous oxide (N2O) and acetylene (C2H2). This result represents a first step towards the imaging of fragile compounds, a category which includes most of the fundamental biological molecules.

Published
2014
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7. $\mathrm{CO_2}$ exploding clusters dynamics probed by XUV fluorescence

Author

Negro, M., Ruf, H., Fabre, B., Dorchies, F., Devetta, M., Staedter, D., Vozzi, C., Mairesse, Y., and Stagira, S.

Subjects
Physics - Atomic and Molecular Clusters
Abstract

Clusters excited by intense laser pulses are a unique source of warm dense matter, that has been the subject of intensive experimental studies. The majority of those investigations concerns atomic clusters, whereas the evolution of molecular clusters excited by intense laser pulses is less explored. In this work we trace the dynamics of $\mathrm{CO_2}$ clusters triggered by a few-cycle 1.45-$\mu$m driving pulse through the detection of XUV fluorescence induced by a delayed 800-nm ignition pulse. Striking differences among fluorescence dynamics from different ionic species are observed.

Published
2014
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8. Fully-tunable femtosecond laser source in the ultraviolet spectral range

Author

Mahieu, B., Coraggia, S., Callegari, C., Coreno, M., De Ninno, G., Devetta, M., Frassetto, F., Garzella, D., Negro, M., Spezzani, C., Vozzi, C., Stagira, S., and Poletto, L.

Subjects
Physics - Optics
Abstract

We demonstrate experimentally the full tunability of a coherent femtosecond source in the whole ultraviolet spectral region. The experiment relies on the technique of high-order harmonic generation driven by a near-infrared parametric laser source in krypton gas. By tuning the drive wavelength in the range between 1100 to 1900 nm, we generated intense harmonics from near to extreme ultraviolet. A number of photons per shot of the order of 10^7 has been measured for the first harmonic orders. Many novel scientific prospects are expected to benefit from the use of such a table-top tunable source.

Published
2011

9. Ultrafast Dynamics in Epitaxial Silicene on Ag(111)

Author

Cinquanta, E., Conte, S.D., Chiappe, D., Grazianetti, C., Fanciulli, M., Molle, A., Cerullo, G., Stagira, S., Scotognella, F., Vozzi, C., Yamanouchi, Kaoru, editor, Cundiff, Steven, editor, de Vivie-Riedle, Regina, editor, Kuwata-Gonokami, Makoto, editor, and DiMauro, Louis, editor

Published
2015
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12. Time-Resolved Chiral X-Ray Photoelectron Spectroscopy with Transiently Enhanced Atomic Site Selectivity: A Free-Electron Laser Investigation of Electronically Excited Fenchone Enantiomers

Author

Faccialà, D., primary, Devetta, M., additional, Beauvarlet, S., additional, Besley, N., additional, Calegari, F., additional, Callegari, C., additional, Catone, D., additional, Cinquanta, E., additional, Ciriolo, A. G., additional, Colaizzi, L., additional, Coreno, M., additional, Crippa, G., additional, De Ninno, G., additional, Di Fraia, M., additional, Galli, M., additional, Garcia, G. A., additional, Mairesse, Y., additional, Negro, M., additional, Plekan, O., additional, Prasannan Geetha, P., additional, Prince, K. C., additional, Pusala, A., additional, Stagira, S., additional, Turchini, S., additional, Ueda, K., additional, You, D., additional, Zema, N., additional, Blanchet, V., additional, Nahon, L., additional, Powis, I., additional, and Vozzi, C., additional

Published
2023
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13. Attosecond Pulse Characterization

Author

Calegari, F., Lucchini, M., Sansone, G., Stagira, S., Vozzi, C., Nisoli, M., Adibi, Ali, Series editor, Asakura, Toshimitsu, Series editor, Rhodes, William T., Editor-in-chief, Hänsch, Theodor W., Series editor, Kamiya, Takeshi, Series editor, Krausz, Ferenc, Series editor, Monemar, Bo A.J., Series editor, Venghaus, Herbert, Series editor, Weber, Horst, Series editor, Weinfurter, Harald, Series editor, Plaja, Luis, editor, Torres, Ricardo, editor, and Zaïr, Amelle, editor

Published
2013
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17. Transient Laser Behavior

Author

Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., Svelto, O., Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., and Svelto, O.

Published
2001
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19. Pumping Processes

Author

Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., Svelto, O., Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., and Svelto, O.

Published
2001
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23. Introductory Concepts

Author

Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., Svelto, O., Cerullo, G., Longhi, S., Nisoli, M., Stagira, S., and Svelto, O.

Published
2001
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30. Microfluidic devices for quasi-phase-matching in high-order harmonic generation

Author

Ciriolo, A. G., primary, Martínez Vázquez, R., additional, Crippa, G., additional, Devetta, M., additional, Faccialà, D., additional, Barbato, P., additional, Frassetto, F., additional, Negro, M., additional, Bariselli, F., additional, Poletto, L., additional, Tosa, V., additional, Frezzotti, A., additional, Vozzi, C., additional, Osellame, R., additional, and Stagira, S., additional

Published
2022
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31. Spectral Interference of Attosecond Light Pulses

Author

Sansone, G., Benedetti, E., Caumes, J-P., Poletto, L., Villoresi, P., Stagira, S., Vozzi, C., De Silvestri, S., Nisoli, M., Rhodes, William T., editor, Adibi, Ali, editor, Asakura, Toshimitsu, editor, Hänsch, Theodor W., editor, Kamiya, Takeshi, editor, Krausz, Ferenc, editor, Monemar, Bo, editor, Venghaus, Herbert, editor, Weber, Horst, editor, Weinfurter, Harald, editor, Watanabe, Shuntaro, editor, and Midorikawa, Katsumi, editor

Published
2007
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32. Quantum Interference in Aligned Molecules

Author

Vozzi, C., Benedetti, E., Calegari, F., Caumes, J-P., Sansone, G., Stagira, S., Nisoli, M., Torres, R., Heesel, E., Kajumba, N., Marangos, J. P., Altucci, C., Velotta, R., Rhodes, William T., editor, Adibi, Ali, editor, Asakura, Toshimitsu, editor, Hänsch, Theodor W., editor, Kamiya, Takeshi, editor, Krausz, Ferenc, editor, Monemar, Bo, editor, Venghaus, Herbert, editor, Weber, Horst, editor, Weinfurter, Harald, editor, Watanabe, Shuntaro, editor, and Midorikawa, Katsumi, editor

Published
2007
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37. Sub 100 attosecond XUV pulses

Author

Mével, E., Sola, I. J., Elouga, L., Constant, E., Strelkov, V., Poletto, L., Villoresi, P., Sansone, G., Benedetti, E., Caumes, J -P., Stagira, S., Vozzi, C., Nisoli, M., Castleman, A. W., Jr., editor, Toennies, J. P., editor, Zinth, W., editor, Yamanouchi, K., editor, Corkum, Paul, editor, Jonas, David M., editor, Miller, R. J. Dwayne., editor, and Weiner, Andrew M., editor

Published
2007
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42. Ultrafast charge carrier dynamics in quantum confined 2D perovskite

Author

Folpini G., Gatto L., Cortecchia D., Devetta M., Crippa G., Vozzi C., Stagira S., Petrozza A., Cinquanta E., Folpini G., Gatto L., Cortecchia D., Devetta M., Crippa G., Vozzi C., Stagira S., Petrozza A., and Cinquanta E.

Subjects
Optical pumping, Terahertz spectroscopy, Charge carrier, Polaron, Exciton, Perovskite
Abstract

We studied the charge carrier dynamics in 2D perovskite NBT2PbI4 by ultrafast optical pump-THz probe spectroscopy. We observed a few ps long relaxation dynamics that can be ascribed to the band to band carrier recombination, in the absence of any contribution from many-body and trap assisted processes. The transient conductivity spectra show that the polaron dynamics is strongly modulated by the presence of a rich exciton population. The polarization field resulting from the exciton formation acts as the source of a restoring force that localizes polarons. This is revealed by the presence of a negative imaginary conductivity. Our results show that the dynamics of excitons in 2D perovskites at room temperature can be detected by monitoring their effect on the conductivity of the photoinduced polaronic carrier.

Published
2020

45. Time-domain spectroscopy of methane excited by resonant high-energy mid-IR pulses

Author

Crippa, G, primary, Faccialà, D, additional, Prasannan Geetha, P, additional, Pusala, A, additional, Musheghyan, M, additional, Assion, A, additional, Bonanomi, M, additional, Cinquanta, E, additional, Ciriolo, A G, additional, Devetta, M, additional, Fazzi, D, additional, Gatto, L, additional, De Silvestri, S, additional, Vozzi, C, additional, and Stagira, S, additional

Published
2021
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46. Time-domain spectroscopy of methane excited by resonant high-energy mid-IR pulses

Author

Crippa, G., Facciala, D., Prasannan Geetha, P., Pusala, A., Musheghyan, M., Assion, A., Bonanomi, M., Cinquanta, E., Ciriolo, A. G., Devetta, M., Fazzi, D., Gatto, L., De Silvestri, S., Vozzi, C., Stagira, S., Crippa, G., Facciala, D., Prasannan Geetha, P., Pusala, A., Musheghyan, M., Assion, A., Bonanomi, M., Cinquanta, E., Ciriolo, A. G., Devetta, M., Fazzi, D., Gatto, L., De Silvestri, S., Vozzi, C., and Stagira, S.

Abstract

We describe the implementation of nonlinear time-domain spectroscopy of rotovibrational IR-active modes in methane through broadband Four-Wave Mixing driven by resonant high-energy mid infrared laser pulses. At high driving pulse intensities we observe an efficient vibrational ladder climbing triggered in the molecules. This study opens the possibility to impulsively and selectively excite molecules of biological interest to high-lying vibrational states and to characterize their dynamics.

Published
2021

47. 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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50. Seeding experiments at SPARC

Author

Giannessi, L., Alesini, D., Biagini, M., Boscolo, M., Bougeard, M., Breger, P., Carré, B., Castellano, M., Cianchi, A., Ciocci, F., Chiadroni, E., Clozza, A., Couprie, M.E., Cultrera, L., Dattoli, G., De Silvestri, S., Di Pace, A., Di Pirro, G., Doria, A., Drago, A., Ferrario, M., Filippetto, D., Frassetto, F., Fusco, V., Gallerano, G.P., Gallo, A., Garzella, D., Ghigo, A., Germano, M., Giovenale, E., Labat, M., Lambert, G., Mattioli, M., Merdji, H., Monchicourt, P., Migliorati, M., Musumeci, P., Nisoli, M., Orlandi, G.L., Ottaviani, P.L., Pace, E., Pagnutti, S., Palumbo, L., Petralia, A., Petrarca, M., Poletto, L., Quattromini, M., Reiche, S., Rosenzweig, J.B., Ronsivalle, C., Salières, P., Sabia, E., Sansone, G., Serafini, L., Spassovsky, I., Spataro, B., Stagira, S., Surrenti, V., Tchebakoff, O., Tomassini, S., Tondello, G., Vaccarezza, C., and Vicario, C.

Published
2008
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