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Author: Bari, S. × Type: Article ×

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    Ultrafast Structural Changes in Chiral Molecules Measured with Free-Electron Lasers
    (Bristol : IOP Publ., 2020) Schmidt, P.; Music, V.; Hartmann, G.; Boll, R.; Erk, B.; Bari, S.; Allum, F.; Baumann, T.M.; Brenner, G.; Brouard, M.; Burt, M.; Coffee, R.; Dörner, S.; Galler, A.; Grychtol, P.; Heathcote, D.; Inhester, L.; Kazemi, M.; Larsson, M.; Li, Z.; Lutmann, A.; Manschwetus, B.; Marder, L.; Mason, R.; Moeller, S.; Osipov, T.; Otto, H.; Passow, C.; Rolles, D.; Rupprecht, P.; Schubert, K.; Schwob, L.; Thomas, R.; Vallance, C.; Von Korff Schmising, C.; Wagner, R.; Walter, P.; Wolf, T.J.A.; Zhaunerchyk, V.; Meyer, M.; Ehresmann, A.; Knie, A.; Demekhin, P.V.; Ilchen, M.
    (X-ray) free-electron lasers are employed to site specifically interrogate atomic fragments during ultra-fast photolysis of chiral molecules via time-resolved photoelectron circular dichroism. © 2020 Institute of Physics Publishing. All rights reserved.
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    Imaging molecular structure through femtosecond photoelectron diffraction on aligned and oriented gas-phase molecules
    (Cambridge [u.a.] : Royal Society of Chemistry, 2014) Boll, R.; Rouzée, A.; Adolph, M.; Anielski, D.; Aquila, A.; Bari, S.; Bomme, C.; Bostedt, C.; Bozek, J.D.; Chapman, H.N.; Christensen, L.; Coffee, R.; Coppola, N.; De, S.; Decleva, P.; Epp, S.W.; Erk, B.; Filsinger, F.; Foucar, L.; Gorkhover, T.; Gumprecht, L.; Hömke, A.; Holmegaard, L.; Johnsson, P.; Kienitz, J.S.; Kierspel, T.; Krasniqi, F.; Kühnel, K.-U.; Maurer, J.; Messerschmidt, M.; Moshammer, R.; Müller, N.L.M.; Rudek, B.; Savelyev, E.; Schlichting, I.; Schmidt, C.; Scholz, F.; Schorb, S.; Schulz, J.; Seltmann, J.; Stener, M.; Stern, S.; Techert, S.; Thøgersen, J.; Trippel, S.; Viefhaus, J.; Vrakking, M.; Stapelfeldt, H.; Küpper, J.; Ullrich, J.; Rudenko, A.; Rolles, D.
    This paper gives an account of our progress towards performing femtosecond time-resolved photoelectron diffraction on gas-phase molecules in a pump-probe setup combining optical lasers and an X-ray free-electron laser. We present results of two experiments aimed at measuring photoelectron angular distributions of laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) and dissociating, laser-aligned 1,4-dibromobenzene (C6H4Br2) molecules and discuss them in the larger context of photoelectron diffraction on gas-phase molecules. We also show how the strong nanosecond laser pulse used for adiabatically laser-aligning the molecules influences the measured electron and ion spectra and angular distributions, and discuss how this may affect the outcome of future time-resolved photoelectron diffraction experiments.