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107 results on '"Sergo, R."'

1. Cavity-mediated thermal control of metal-to-insulator transition in 1T-TaS2

Author

Jarc, G., Mathengattil, S. Y., Montanaro, A., Giusti, F., Rigoni, E. M., Sergo, R., Fassioli, F., (0000-0002-8090-9198) Winnerl, S., Zilio, S. D., Mihailovic, D., Prelovšek, P., Eckstein, M., Fausti, D., Jarc, G., Mathengattil, S. Y., Montanaro, A., Giusti, F., Rigoni, E. M., Sergo, R., Fassioli, F., (0000-0002-8090-9198) Winnerl, S., Zilio, S. D., Mihailovic, D., Prelovšek, P., Eckstein, M., and Fausti, D.

Abstract

Placing quantum materials into optical cavities can provide a unique platform to control quantum cooperative properties of matter, in the regimes of both weak and strong light-matter coupling. Here we show the first experimental evidence of the reversible touchless control of a metal-to-insulator phase transition in the charge density wave material 1T-TaS2 embedded in a tunable THz optical cavity. The switch between conductive and insulating behavior, which is obtained by mechanically tuning the distance between the cavity mirrors and their alignment, is related to a significant renormalization of the sample temperature. This suggests a Purcell-like scenario in which the spectral profile of the cavity modifies the energy exchange between the material and the external electromagnetic field. Our findings uncover a new path to control the thermodynamics and macroscopic transport properties of quantum materials by engineering their electromagnetic environment.

Published
2023

8. PERCIVAL : Possible applications in X-ray micro-tomography

Author

Pinaroli, G., Lautizi, G., Donato, S., Stebel, L., Cautero, G., Giuressi, D., Gregori, I., Zilio, S. D., Sergo, R., Scarcia, M., Cudin, I., Wunderer, C. B., Correa, J., Marras, A., Aplin, S., Boitrelle, B., Orsini, F., Goettlicher, P., Kuhn, M., Lange, S., Niemann, M., Shevyakov, I., Zimmer, M., Guerrini, N., Marsh, B., Sedgwick, I., Greer, A., Nicholls, T., Pedersen, U. K., Tartoni, N., Hyun, H., Kim, K., Rah, S., Graafsma, Heinz, Menk, R. H., Pinaroli, G., Lautizi, G., Donato, S., Stebel, L., Cautero, G., Giuressi, D., Gregori, I., Zilio, S. D., Sergo, R., Scarcia, M., Cudin, I., Wunderer, C. B., Correa, J., Marras, A., Aplin, S., Boitrelle, B., Orsini, F., Goettlicher, P., Kuhn, M., Lange, S., Niemann, M., Shevyakov, I., Zimmer, M., Guerrini, N., Marsh, B., Sedgwick, I., Greer, A., Nicholls, T., Pedersen, U. K., Tartoni, N., Hyun, H., Kim, K., Rah, S., Graafsma, Heinz, and Menk, R. H.

Abstract

X-ray computed micro-tomography (μCT) is one of the most advanced and common non-destructive techniques in the field of medical imaging and material science. It allows recreating virtual models (3D models), without destroying the original objects, by measuring three-dimensional X-ray attenuation coefficient maps of samples on the (sub) micrometer scale. The quality of the images obtained using μCT is strongly dependent on the performance of the associated X-ray detector i.e. to the acquisition of information of the X-ray beam traversing the patient/sample being precise and accurate. Detectors for μCT have to meet the requirements of the specific tomography procedure in which they are going to be used. In general, the key parameters are high spatial resolution, high dynamic range, uniformity of response, high contrast sensitivity, fast acquisition readout and support of high frame rates. At present the detection devices in commercial μCT scanners are dominated by charge-coupled devices (CCD), photodiode arrays, CMOS acquisition circuits and more recently by hybrid pixel detectors. Monolithic CMOS imaging sensors, which offer reduced pixel sizes and low electronic noise, are certainly excellent candidates for μCT and may be used for the development of novel high-resolution imaging applications. The uses of monolithic CMOS based detectors such as the PERCIVAL detector are being recently explored for synchrotron and FEL applications. PERCIVAL was developed to operate in synchrotron and FEL facilities in the soft X-ray regime from 250 eV to 1 keV and it could offer all the aforementioned technical requirements needed in μCT experiments. In order to adapt the system for a typical tomography application, a scintillator is required, to convert incoming X-ray radiation (∼ tens of KeV) into visible light which may be detected with high efficiency. Such a taper-based scintillator was developed and mounted in front of the sensitive area of the PERCIVAL imager. In this presentat

Published
2020
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11. PERCIVAL: possible applications in X-ray micro-tomography

Author

Pinaroli, G., primary, Lautizi, G., additional, Donato, S., additional, Stebel, L., additional, Cautero, G., additional, Giuressi, D., additional, Gregori, I., additional, Zilio, S. Dal, additional, Sergo, R., additional, Scarcia, M., additional, Cudin, I., additional, Wunderer, C.B., additional, Correa, J., additional, Marras, A., additional, Aplin, S., additional, Boitrelle, B., additional, Orsini, F., additional, Goettlicher, P., additional, Kuhn, M., additional, Lange, S., additional, Niemann, M., additional, Shevyakov, I., additional, Zimmer, M., additional, Guerrini, N., additional, Marsh, B., additional, Sedgwick, I., additional, Greer, A., additional, Nicholls, T., additional, Pedersen, U.K., additional, Tartoni, N., additional, Hyun, H., additional, Kim, K., additional, Rah, S., additional, Graafsma, H., additional, and Menk, R.H., additional

Published
2020
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17. Bulk electronic properties of V< sub> 2 O< sub> 3 probed by hard X-ray photoelectron spectroscopy

Author

Panaccione, G, Sacchi, M, Torelli, P, Offi, F, Cautero, Giuseppe, Sergo, R, Fondacaro, A, Henriquet, C, Huotari, S, Monaco, G, Paolasini, L., Panaccione, G, Sacchi, M, Torelli, P, Offi, F, Cautero, Giuseppe, Sergo, R, Fondacaro, A, Henriquet, C, Huotari, S, Monaco, G, and Paolasini, L.

Subjects
Electronic properties, Photoemission spectroscopy, Strongly correlated systems, Electronic propertie
Abstract

We have measured bulk sensitive photoemission spectra of pure vanadium sesquioxide (V2O3) in its metallic phase as a function of different surface preparations. We observe the presence of a clear coherent peak in the vicinity of the Fermi level and of satellites intensities at the V 2p core level. After scraping, the coherent intensities are almost completely suppressed in both core level and valence band. Our results suggest a remarkable change of the screening properties in strongly correlated systems when going from the surface to the volume.

Published
2007

18. Bulk electronic properties of V2O3 probed by hard X-ray photoelectron spectroscopy

Author

Panaccione, G., Sacchi, M., Torelli, P., Offi, F., Sergo, R., Fondacaro, A., Henriquet, C., Huotari, S., Monaco, G., CAUTERO, GIUSEPPE, Panaccione, G., Sacchi, M., Torelli, P., Offi, F., Cautero, Giuseppe, Sergo, R., Fondacaro, A., Henriquet, C., Huotari, S., and Monaco, G.

Subjects
Electronic properties, Photoemission spectroscopy, Strongly correlated systems, Electronic propertie
Abstract

We have measured bulk sensitive photoemission spectra of pure vanadium sesquioxide (V2O3) in its metallic phase as a function of different surface preparations. We observe the presence of a clear coherent peak in the vicinity of the Fermi level and of satellites intensities at the V 2p core level. After scraping, the coherent intensities are almost completely suppressed in both core level and valence band. Our results suggest a remarkable change of the screening properties in strongly correlated systems when going from the surface to the volume.

Published
2007

19. Design and optimization of a modular setup for measurements of three-dimensional spin polarization with ultrafast pulsed sources

Author

Pincelli, T., primary, Petrov, V. N., additional, Brajnik, G., additional, Ciprian, R., additional, Lollobrigida, V., additional, Torelli, P., additional, Krizmancic, D., additional, Salvador, F., additional, De Luisa, A., additional, Sergo, R., additional, Gubertini, A., additional, Cautero, G., additional, Carrato, S., additional, Rossi, G., additional, and Panaccione, G., additional

Published
2016
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21. Bulk sensitive photoemission: first results of VOLPE project at ESRF RID G-7348-2011 RID F-8940-2010

Author

Paolicelli G, Fondacaro A, Offi F, Cautero G, Cautero M, Krastanov B, Lacovig P, Pittana P, Sergo R, Tommasini R, Torelli P, Sacchi M, Grioni M, Monaco G, Panaccione G., STEFANI, Giovanni, Paolicelli, G, Fondacaro, A, Offi, F, Stefani, Giovanni, Cautero, G, Cautero, M, Krastanov, B, Lacovig, P, Pittana, P, Sergo, R, Tommasini, R, Torelli, P, Sacchi, M, Grioni, M, Monaco, G, and Panaccione, G.

Subjects
Physics::Instrumentation and Detectors
Abstract

We present recent results obtained with a novel spectrometer developed within the EU project VOLPE (VOLume PhotoEmission from solids with synchrotron radiation), now operational at ESRF (Beamline ID 16), where we were able to achieve high energy resolution as well as good statistics photoemission spectra up to 6-8 keV of photoelectron kinetic energy. The spectrometer is a hemispherical deflector analyzer with electrostatic input lens and 2D position sensitive detector. Ag 3d, An 4f and valence band spectra have been measured from polycrystalline Ag and An, displaying an overall energy resolution (photons + analyzer) of about 71 meV at 6 keV, as measured at 18 K on the Fermi edge. The corresponding resolving power of 8 x 10(4) is one of the highest values achieved in photoemission measurements from solid samples. (c) 2005 Elsevier B.V. All rights reserved.

Published
2005

22. Experimental setup for high energy photoemission using synchrotron radiation RID F-8940-2010 RID G-7348-2011

Author

Torelli P, Sacchi M, Cautero G, Cautero M, Krastanov B, Lacovig P, Pittana P, Sergo R, Tommasini R, Fondacaro A, Offi F, Paolicelli G, Grioni M, Verbeni R, Monaco G, Panaccione G., STEFANI, Giovanni, Torelli, P, Sacchi, M, Cautero, G, Cautero, M, Krastanov, B, Lacovig, P, Pittana, P, Sergo, R, Tommasini, R, Fondacaro, A, Offi, F, Paolicelli, G, Stefani, Giovanni, Grioni, M, Verbeni, R, Monaco, G, and Panaccione, G.

Abstract

The instrument VOLPE (volume photoemission from solids) is an experimental setup dedicated to high energy photoemission (PE) experiments. The instrument is equipped with an electrostatic hemispherical spectrometer especially designed to analyze high energy electrons (up to 10 keV) with high resolving power. In order to attain an energy resolution of a few tens of millielectron volts, we designed and constructed a dedicated input lens system, high stability power supplies, and a low dark-count detector and readout electronics. The system has been tested and is now operational on the ID16 beamline at European Synchrotron Radiation Facility, where an optical layout has been developed to perform high energy, high resolution PE experiments. First results show an overall energy resolution (electron + photon) of 71+/-7 meV at 5934 eV. The effective attenuation length of the photoelectrons is estimated to be 5+/-0.5 nm at a kinetic energy of 5 keV. (C) 2005 American Institute of Physics.

Published
2005

23. Hard x-ray photoemission spectroscopy with synchrotron radiation

Author

OFFI, FRANCESCO, STEFANI, Giovanni, CAUTERO G., CAUTERO M., FONDACARO A., GRIONI M., LACOVIG P., MONACO G., MULAZZI M., PAOLICELLI G., PITTANA P., SACCHI M., SERGO R., TOMMASINI R., TORELLI P., PANACCIONE G., Offi, Francesco, Cautero, G., Cautero, M., Fondacaro, A., Grioni, M., Lacovig, P., Monaco, G., Mulazzi, M., Paolicelli, G., Pittana, P., Sacchi, M., Sergo, R., Stefani, Giovanni, Tommasini, R., Torelli, P., and Panaccione, G.

Abstract

Non disponibile

Published
2004

24. A beam-shapingsystemforTIMEXbeamline

Author

Svetina, C., Masciovecchio, C., Sostero, G., Sergo, R., Borghes, R., Callegari, C., d'Amico, Frank, Bencivenga, F., Di Cicco, A., Cocco, D., Sincrotrone Trieste, CNISM, DipartimentodiFisicaUniversit a degliStudidiCamerino, CNISM, Institut de minéralogie et de physique des milieux condensés (IMPMC), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Free electronlaser(FEL), [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Beam-shaping, Warm densematter(WDM), Active optics
Abstract

International audience; FERMI@ElettraisaFreeElectronLaser(FEL)userfacilitycurrentlyunderconstructionatSincrotrone Trieste inItaly.Itwillprovideaspatiallycoherentandtransform-limitedphotonbeaminthesub-ps regime,coveringtheVUV/SoftX-rayrange(from100downto1.33nm).Thankstoitshighfluencethis 4th generationlightsourcewillbeabletocreateandprobewarmdensematter(WDM)insidethe TIMEX end-station.SincetheWDMstatehasashortlifetime(afewps),measurementofbasicphysical quantities,suchastemperatureanddensity,isachallengeandnewapproachesareneeded.Forthis reason anewmethodhasbeenproposedformeasuringtemperatureusingaslowlyresponding pyrometricprobe(Principietal.,2010 [1]).However,thetechniquedoesrequirethespatialphoton beam profiletobeproperlyshapedatthesample.Thiscanbedoneusinganactiveoptic(i.e.a deformableplanemirror)placedbeforetheellipticalfocusingmirror.Ray-tracingsimulationsand metrologymeasurementsonaprototypehavebeenperformedandtheresultsarepresentedhere

Published
2011

25. Commissioning and Initial Operation of FERMI@Elettra

Author

Di Mitri, S., Allaria, E., Appio, R., Badano, L., Bassanese, S., Bencivenga, F., Borga, A., Bossi, M., Busetto, E., Callegari, C., Capotondi, F., Casarin, K., Castronovo, D., Cinquegrana, P., Cocco, D., Cornacchia, M., Craievich, P., Cucini, R., Cudin, I., DAL FORNO, Massimo, D’Amico, F., D’Auria, G., Danailov, M. B., Delgiusto, P., Demidovich, A., De Monte, R., De Ninno, G., Diviacco, B., Fabris, A., Fabris, R., Fawley, W., Ferianis, M., Ferrari, Eugenio, Ferry, S., Froehlich, L., Furlan Radivo, P., Karantzoulis, E., Kiskinova, M., Gaio, G., Gelmetti, F., Giannessi, L., Gobessi, R., Ivanov, R., Lonza, M., Lutman, A., Mahieu, B., Masciovecchio, C., Menk, R. H., Milloch, M., Musardo, M., Noe', Salvatore, Nikolov, I., Parmigiani, Fulvio, Pavlovic, L., Pedersoli, E., Penco, G., Petronio, M., Predonzani, M., Principi, E., Quai, E., Quondam, G., Rossi, F., Rumiz, L., Scafuri, C., Serpico, C., Sigalotti, P., Spampinati, S., Spezzani, C., Svandrlik, M., Svetina, C., Trovo’, M., Vascotto, A., Veronese, M., Visintini, R., Zaccaria, M., Zangrando, D., Zangrando, M., Wang, D., Alagia, M., Avaldi, L., Coreno, M., Feyer, V., Kivimaki, A., Bolognesi, P., de Simone, M., O’Keeffe, P., Devetta, M., Mazza, T., Piseri, P., Prince, K., Richter, R., Sergo, R., Stranges, S., Lyamayev, V., Ovcharenko, Y., Sjostrom, M., Biedron, S., Milton, S., IPAC'11/EPS-AG, S., Di Mitri, E., Allaria, R., Appio, L., Badano, S., Bassanese, F., Bencivenga, A., Borga, M., Bossi, E., Busetto, C., Callegari, F., Capotondi, K., Casarin, D., Castronovo, P., Cinquegrana, D., Cocco, M., Cornacchia, P., Craievich, R., Cucini, I., Cudin, DAL FORNO, Massimo, F., D’Amico, G., D’Auria, M. B., Danailov, P., Delgiusto, A., Demidovich, R., De Monte, G., De Ninno, B., Diviacco, A., Fabri, R., Fabri, W., Fawley, M., Feriani, Ferrari, Eugenio, S., Ferry, L., Froehlich, P., Furlan Radivo, E., Karantzouli, M., Kiskinova, G., Gaio, F., Gelmetti, L., Giannessi, R., Gobessi, R., Ivanov, M., Lonza, A., Lutman, B., Mahieu, C., Masciovecchio, R. H., Menk, M., Milloch, M., Musardo, Noe', Salvatore, I., Nikolov, Parmigiani, Fulvio, L., Pavlovic, E., Pedersoli, G., Penco, M., Petronio, M., Predonzani, E., Principi, E., Quai, G., Quondam, F., Rossi, L., Rumiz, C., Scafuri, C., Serpico, P., Sigalotti, S., Spampinati, C., Spezzani, M., Svandrlik, C., Svetina, M., Trovo’, A., Vascotto, M., Veronese, R., Visintini, M., Zaccaria, D., Zangrando, M., Zangrando, D., Wang, M., Alagia, L., Avaldi, M., Coreno, V., Feyer, A., Kivimaki, P., Bolognesi, M., de Simone, P., O’Keeffe, M., Devetta, T., Mazza, P., Piseri, K., Prince, R., Richter, R., Sergo, S., Strange, V., Lyamayev, Y., Ovcharenko, M., Sjostrom, S., Biedron, and S., Milton

Subjects
FEL, particle accelerator, free-electron-laser
Abstract

This article describes the design goals of FERMI@Elettra, reports on the goals achieved so far and shows how the facility development has been driven by the new research frontier of ultra-fast, extreme ultra-violet and soft X-ray science. The commissioning phases and first experience with user pilot experiments are presented and discussed. Copyright © 2011 by IPAC'11/EPS-AG.

Published
2011

28. Tunability experiments at the FERMI@Elettra free-electron laser

Author

Allaria, E, primary, Battistoni, A, additional, Bencivenga, F, additional, Borghes, R, additional, Callegari, C, additional, Capotondi, F, additional, Castronovo, D, additional, Cinquegrana, P, additional, Cocco, D, additional, Coreno, M, additional, Craievich, P, additional, Cucini, R, additional, D'Amico, F, additional, Danailov, M B, additional, Demidovich, A, additional, De Ninno, G, additional, Di Cicco, A, additional, Di Fonzo, S, additional, Di Fraia, M, additional, Di Mitri, S, additional, Diviacco, B, additional, Fawley, W M, additional, Ferrari, E, additional, Filipponi, A, additional, Froehlich, L, additional, Gessini, A, additional, Giangrisostomi, E, additional, Giannessi, L, additional, Giuressi, D, additional, Grazioli, C, additional, Gunnella, R, additional, Ivanov, R, additional, Mahieu, B, additional, Mahne, N, additional, Masciovecchio, C, additional, Nikolov, I P, additional, Passos, G, additional, Pedersoli, E, additional, Penco, G, additional, Principi, E, additional, Raimondi, L, additional, Sergo, R, additional, Sigalotti, P, additional, Spezzani, C, additional, Svetina, C, additional, Trovò, M, additional, and Zangrando, M, additional

Published
2012
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29. An active optics system for EUV/soft x-ray beam shaping

Author

Svetina, C., primary, Cocco, D., additional, Di Cicco, A., additional, Fava, C., additional, Gerusina, S., additional, Gobessi, R., additional, Mahne, N., additional, Masciovecchio, C., additional, Principi, E., additional, Raimondi, L., additional, Rumiz, L., additional, Sergo, R., additional, Sostero, G., additional, Spiga, D., additional, and Zangrando, M., additional

Published
2012
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34. The photon analysis, delivery, and reduction system at the FERMI@Elettra free electron laser user facility

Author

Zangrando, M., primary, Abrami, A., additional, Bacescu, D., additional, Cudin, I., additional, Fava, C., additional, Frassetto, F., additional, Galimberti, A., additional, Godnig, R., additional, Giuressi, D., additional, Poletto, L., additional, Rumiz, L., additional, Sergo, R., additional, Svetina, C., additional, and Cocco, D., additional

Published
2009
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35. The FERMI@Elettra FEL photon transport system

Author

Cocco, D., primary, Abrami, A., additional, Bianco, A., additional, Cudin, I., additional, Fava, C., additional, Giuressi, D., additional, Godnig, R., additional, Parmigiani, F., additional, Rumiz, L., additional, Sergo, R., additional, Svetina, C., additional, and Zangrando, M., additional

Published
2009
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37. Experimental setup for high energy photoemission using synchrotron radiation

Author

Torelli, P., primary, Sacchi, M., additional, Cautero, G., additional, Cautero, M., additional, Krastanov, B., additional, Lacovig, P., additional, Pittana, P., additional, Sergo, R., additional, Tommasini, R., additional, Fondacaro, A., additional, Offi, F., additional, Paolicelli, G., additional, Stefani, G., additional, Grioni, M., additional, Verbeni, R., additional, Monaco, G., additional, and Panaccione, G., additional

Published
2005
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39. Super ESCA: First beamline operating at ELETTRA

Author

Abrami, A., primary, Barnaba, M., additional, Battistello, L., additional, Bianco, A., additional, Brena, B., additional, Cautero, G., additional, Chen, Q. H., additional, Cocco, D., additional, Comelli, G., additional, Contrino, S., additional, DeBona, F., additional, Di Fonzo, S., additional, Fava, C., additional, Finetti, P., additional, Furlan, P., additional, Galimberti, A., additional, Gambitta, A., additional, Giuressi, D., additional, Godnig, R., additional, Jark, W., additional, Lizzit, S., additional, Mazzolini, F., additional, Melpignano, P., additional, Olivi, L., additional, Paolucci, G., additional, Pugliese, R., additional, Qian, S. N., additional, Rosei, R., additional, Sandrin, G., additional, Savoia, A., additional, Sergo, R., additional, Sostero, G., additional, Tommasini, R., additional, Tudor, M., additional, Vivoda, D., additional, Wei, F.‐Q., additional, and Zanini, F., additional

Published
1995
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40. A photoelectron velocity map imaging spectrometer for experiments combining synchrotron and laser radiations.

Author

O'Keeffe, P., Bolognesi, P., Coreno, M., Moise, A., Richter, R., Cautero, G., Stebel, L., Sergo, R., Pravica, L., Ovcharenko, Y., and Avaldi, L.

Subjects
SPECTROMETERS, ELECTROOPTICAL photography, IMAGING systems, EXPERIMENTS, SYNCHROTRON radiation, LASER beams, OPTICAL resolution
Abstract

A velocity map imaging/ion time-of-flight spectrometer designed specifically for pump-probe experiments combining synchrotron and laser radiations is described. The in-house built delay line detector can be used in two modes: the high spatial resolution mode and the coincidence mode. In the high spatial resolution mode a kinetic energy resolution of 6% has been achieved. The coincidence mode can be used to improve signal-to-noise ratio for the pump-probe experiments either by using a gate to count electrons only when the laser is present or by recording coincidences with the ion formed in the ionization process. [ABSTRACT FROM AUTHOR]

Published
2011
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41. Commissioning and initial operation of FEZRMI@ELETTRA

Author

Di Mitri, S., Allaria, E., Appio, R., Badano, L., Bassanese, S., Bencivenga, F., Borga, A., Bossi, M., Busetto, E., Callegari, C., Capotondi, F., Casarin, K., Castronovo, D., Cinquegrana, P., Cocco, D., Cornacchia, M., Craievich, P., Cucini, R., Cudin, I., Dal Forno, M., D Amico, F., D Auria, G., Danailov, M. B., Delgiusto, P., Demidovich, A., Monte, R., Ninno, G., Diviacco, B., Fabris, A., Fabris, R., Fawley, W., Ferianis, M., Ferrari, E., Ferry, S., Froehlich, L., Furlan Radivo, P., Karantzoulis, E., Kiskinova, M., Gaio, G., Gelmetti, F., Giannessi, L., Gobessi, R., Ivanov, R., Lonza, M., Lutman, A., Mahieu, B., Masciovecchio, C., Menk, R. H., Milloch, M., Musardo, M., Noe, S., Nikolov, I., Parmigiani, F., Pavlovic, L., Emanuele Pedersoli, Penco, G., Petronio, M., Predonzani, M., Principi, E., Quai, E., Quondam, G., Rossi, F., Rumiz, L., Scafuri, C., Serpico, C., Sigalotti, P., Spampinati, S., Spezzani, C., Svandrlik, M., Svetina, C., Trovo, M., Vascotto, A., Veronese, M., Visintini, R., Zaccaria, M., Zangrando, D., Zangrando, M., Wang, D., Alagia, M., Avaldi, L., Coreno, M., Feyer, V., Kivimaki, A., Bolognesi, P., Simone, M., O Keeffe, P., Devetta, M., Mazza, T., Piseri, P., Prince, K., Richter, R., Sergo, R., Stranges, S., Lyamayev, V., Ovcharenko, Y., Sjostrom, M., Biedron, S., and Milton, S.

42. The Low Density Matter (LDM) beamline of FERMI: optical layout and first commissioning

Author

Svetina, C., Grazioli, C., Alagia, M., Avaldi, L., Cautero, G., de Simone, M., Devetta, M., Di Fraia, M., Drabbels, Marcel, Fava, C., Feyer, V., Finetti, P., Gerusina, S., Katzy, R., Kivimaki, A., Lyamayev, V., Mahne, N., Mazza, T., Moises, A., Moller, T., O'Keeffe, P., Ovcharenko, Y., Piseri, P., Plekan, O., Prince, K., Raimondi, L., Sergo, R., Stienkemeier, F., Stranges, S., Zangro, M, Coreno, M., and Callegari, C.

Subjects
beam line, metrology, Physics::Instrumentation and Detectors, Physics::Accelerator Physics, free electron laser, low density matter, photon transport
Abstract

The Low Density Matter (LDM) beamline has been built as part of the FERMI free-electron laser (FEL) facility to serve the atomic, molecular and cluster physics community. After the commissioning phase, it received the first external users at the end of 2012. The design and characterization of the LDM photon transport system is described, detailing the optical components of the beamline.

47. Production of excited H atoms at the C Is edge of the methane molecule studied by VUV-photon-photoion and metastable-fragment-photoion coincidence experiments.

Author

Kivimäki, A., Alvarez-Ruiz, J., Sergo, R., and Richter, R.

Subjects
*HYDROGEN atom, *METHANE, *ULTRAVIOLET radiation, *PHOTOIONIZATION, *COINCIDENCE, *PHYSICS experiments, *PARTICLES (Nuclear physics)
Abstract

Coincidences between neutral particles and photoions have been measured at the C Is edge of the CH4 molecule. These neutral particles are either vacuum ultraviolet (VUV) photons or metastable fragments and their contributions can be separated temporally. Observed VUV-photon-photoion coincidences were mostly triggered by Lyman emission in excited H atoms. Two metastable fragment-photoion channels were observed and assigned to H*-H+ and H*-CHn+ (n = 0-3) coincidences, where H* signifies a metastable H atom. The coincidence yields as a function of photon energy revealed all the core excitations, but were particularly enhanced just above the C I.v ionization threshold and also displayed the vibrational structure related to the core-ionized C Is-1 state. The metastable H atoms observed in the present study were produced in highly excited Rydberg states and could be partly field ionized. The approximate kinetic energy distributions of the metastable H* atoms have been derived from the H*-H+ coincidence measurements performed at the C Is --»· 3p and 3d resonances as well as just above the C 1 s threshold. [ABSTRACT FROM AUTHOR]

Published
2013
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48. The MagneDyn beamline at the FERMI free electron laser

Author

Marco Malvestuto, Antonio Caretta, Richa Bhardwaj, Simone Laterza, Fulvio Parmigiani, Alessandro Gessini, Matteo Zamolo, Fabio Galassi, Rudi Sergo, Giuseppe Cautero, Miltcho B. Danailov, Alexander Demidovic, Paolo Sigalotti, Marco Lonza, Roberto Borghes, Adriano Contillo, Alberto Simoncig, Michele Manfredda, Lorenzo Raimondi, Marco Zangrando, Malvestuto, M., Caretta, A., Bhardwaj, R., Laterza, S., Parmigiani, F., Gessini, A., Zamolo, M., Galassi, F., Sergo, R., Cautero, G., Danailov, M. B., Demidovic, A., Sigalotti, P., Lonza, M., Borghes, R., Contillo, A., Simoncig, A., Manfredda, M., Raimondi, L., and Zangrando, M.

Subjects
Time resolved X-ray spectroscopy, Instrumentation
Abstract

The scope of this paper is to outline the main marks and performances of the MagneDyn beamline, which was designed and built to perform ultrafast magnetodynamic studies in solids. Open to users since 2019, MagneDyn operates with variable circular and linear polarized femtosecond pulses delivered by the externally laser-seeded FERMI free-electron laser (FEL). The very high degree of polarization, the high pulse-to-pulse stability, and the photon energy tunability in the 50-300 eV range allow performing advanced time-resolved magnetic dichroic experiments at the K-edge of light elements, e.g., carbon and at the M- and N-edge of the 3d-transition-metals and rare earth elements, respectively. To this end, two experimental end-stations are available. The first is equipped with an in situ dedicated electromagnet, a cryostat, and an extreme ultraviolet Wollaston-like polarimeter. The second, designed for carry-in user instruments, hosts also a spectrometer for pump-probe resonant x-ray emission and inelastic spectroscopy experiments with a sub-eV energy resolution. A Kirkpatrick-Baez active optics system provides a minimum focus of similar to 20x20 mu m(2) FWHM at the sample. A pump laser setup, synchronized with the FEL-laser seeding system, delivers sub-picosecond pulses with photon energies ranging from the mid-IR to near-UV for optical pump-FEL probe experiments with a minimal pump-probe jitter of few femtoseconds. The overall combination of these features renders MagneDyn a unique state-of-the-art tool for studying ultrafast magnetic and resonant emission phenomena in solids. Published under an exclusive license by AIP Publishing.

Published
2022

49. A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

Author

Roberto Flammini, Fulvio Parmigiani, Miltcho B. Danailov, Antonio Caretta, Marco Zangrando, Simone Dal Zilio, Simone Laterza, R. Sergo, Alexander Demidovich, Carlo Dri, Fabio Galassi, Valentina Bonanni, Alessandro Gessini, Matteo Zamolo, Paolo Moras, Marco Malvestuto, A. Simoncig, Giuseppe Cautero, Caretta, A., Laterza, S., Bonanni, V., Sergo, R., Dri, C., Cautero, G., Galassi, F., Zamolo, M., Simoncig, A., Zangrando, M., Gessini, A., Zilio, S. D., Flammini, R., Moras, P., Demidovich, A., Danailov, M., Parmigiani, F., and Malvestuto, M.

Subjects
Permalloy, spectroscopy, 02 engineering and technology, free electron laser, Photon energy, 01 natural sciences, Experimental Methodologies, ARTICLES, Optics, Kerr effect, 0103 physical sciences, 010306 general physics, Instrumentation, Magneto, Physics, Radiation, Crystallography, business.industry, Linear polarization, Free-electron laser, Polarimeter, 021001 nanoscience & nanotechnology, Condensed Matter Physics, QD901-999, Extreme ultraviolet, 0210 nano-technology, business, Realization (systems)
Abstract

Here, we report on the conceptual design, the hardware realization, and the first experimental results of a novel and compact x-ray polarimeter capable of a single-pulse linear polarization angle detection in the extreme ultraviolet photon energy range. The polarimeter is tested by performing time resolved pump-probe experiments on a Ni80Fe20 Permalloy film at the M-2,M-3 Ni edge at an externally seeded free-electron laser source. Comparison with similar experiments reported in the literature shows the advantages of our approach also in view of future experiments.

Published
2021

50. Photoionization Dynamics of the Tetraoxo Complexes OsO4 and RuO4

Author

Michele Alagia, Stefano Stranges, Federico Salvador, Paolo Bertoch, R. Sergo, Davide Vivoda, Oliver Schalk, L. Stebel, Carlo Dri, Giuseppe Cautero, D. Benedetti, Luca Schio, Melanie Mucke, Daniele Toffoli, Robert Richter, Piero Decleva, Richard D. Thomas, Schio, L., Alagia, M., Toffoli, D., Decleva, P., Richter, R., Schalk, O., Thomas, R. D., Mucke, M., Salvador, F., Bertoch, P., Benedetti, D., Dri, C., Cautero, G., Sergo, R., Stebel, L., Vivoda, D., and Stranges, S.

Subjects
Ionization, photoelectron spectroscopy, Photoionization, Photon energy, 010402 general chemistry, 01 natural sciences, DFT, Inorganic Chemistry, Atomic orbital, TDDFT, Theoretical and computational chemistry, Physics::Atomic and Molecular Clusters, PHOTOIONIZATION DYNAMICS, Time dependant density functional theory, Photoionization,Energy, Physics::Atomic Physics, Physical and Theoretical Chemistry, synchrotron radiation, photoelectron dynamics, Osmium tetroxide, Valence (chemistry), Energy, 010405 organic chemistry, Chemistry, Time-dependent density functional theory, 0104 chemical sciences, Excited state, Density functional theory, Atomic physics, ANGULAR DISTRIBUTION, CROSS SECTION
Abstract

The photoionization dynamics of OsO4 and RuO4, chosen as model systems of small-size mononuclear heavy-metal complexes, has been theoretically studied by the time-dependent density functional theory (TDDFT). Accurate experimental measurements of photoionization dynamics as a benchmarking test for the theory are reported for the photoelectron asymmetry parameters of outer valence ionizations of OsO4, measured in the 17-90 eV photon energy range. The theoretical results are in good agreement with the available experimental data. The observed dynamical behavior of partial cross sections and asymmetry parameters has been related to both the coupling to the continuum of discrete excited states, giving strong modulations in the photon energy dependency, and the atomic composition of the initial ionized states, which determines the rate of decay of ionization probability for increasing excitation energies. Overall, an extensive analysis of the photoionization dynamics for valence and core orbitals is presented, showing good agreement with all the available experimental data. This provides confidence for the validity of the TDDFT approach in describing photoionization of heavy transition element compounds, with the perspective of being used for larger systems. Further experimental work is suggested for RuO4 to gather evidence of the sensitivity of the theoretical method to the nature of the metal atom.

Published
2020

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