Probing the UV-Induced Photodissociation of CH3I and C6H3F2I with Femtosecond Time-Resolved Coulomb Explosion Imaging at FLASH

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  • Evgeny Savelyev, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Kasra Amini, University of Oxford, Oxford, United Kingdom
  • Felix Brauße, Max Born Institute, 12489 Berlin, Germany
  • Nora Berrah, University of Connecticut, Storrs, United States
  • Cédric Bomme, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Mark Brouard, University of Oxford, Oxford, United Kingdom
  • Michael Burt, University of Oxford, Oxford, United Kingdom
  • Lauge Christensen
  • ,
  • Stefan Düsterer, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Benjamin Erk, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Hauke Höppner, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Thomas Kierspel, Center for Free Electron Laser Science, DESY, Germany
  • Faruk Krecinic, Max Born Institute, 12489 Berlin, Germany
  • Alexandra Lauer, University of Oxford, Oxford, United Kingdom
  • Jason W. L. Lee, University of Oxford, Oxford, United Kingdom
  • Maria Müller, Technische Universität Berlin, Germany
  • Erland Müller, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Terence Mullins, Center for Free Electron Laser Science, DESY, Germany
  • Harald Redlin, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Nora Schirmel, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Jan Thøgersen
  • Simone Techert, Deutsches Elektronen-Synchrotron (DESY), Germany
  • Sven Toleikis, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Rolf Treusch, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
  • Sebastian Trippel, Center for Free Electron Laser Science, DESY, Germany
  • Anatoli Ulmer, Technische Universität Berlin, Germany
  • Claire Vallance, University of Oxford, Oxford, United Kingdom
  • Joss Wiese, Center for Free Electron Laser Science, DESY, Germany
  • Per Johnsson, Lund university, Sweden
  • Jochen Küpper, Center for Free Electron Laser Science, DESY, Germany
  • Artem Rudenko, Kansas State Univ, Kansas State University, JR Macdonald Lab, United States
  • Arnaud Rouzée, Max Born Institute, 12489 Berlin, Germany
  • Henrik Stapelfeldt
  • Daniel Rolles, Kansas State Univ, Kansas State University, JR Macdonald Lab, United States
  • Rebecca Boll, Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
We explore time-resolved Coulomb explosion induced by intense, extreme ultraviolet (XUV) femtosecond pulses from the FLASH free-electron laser as a method to image photo-induced molecular dynamics in two molecules, iodomethane and difluoroiodobenzene. At an excitation wavelength of 267 nm, the dominant reaction pathway in both molecules is neutral cleavage of the carbon--iodine bond, which allows studying the influence of the molecular environment on the XUV absorption and the subsequent Coulomb explosion process. The XUV probe pulse induces local inner-shell ionization of atomic iodine in dissociating iodomethane, in contrast to non-selective ionization of all photofragments in difluoroiodobenzene. The resulting signals reveal evidence of electron transfer from methyl and phenyl moieties to a multiply charged iodine ion. In addition, we find indications for ultrafast charge rearrangement on the phenyl radical, suggesting that time-resolved Coulomb explosion imaging is sensitive to the localization of charge in extended molecules.
Original languageEnglish
JournalarXiv
Number of pages10
Publication statusPublished - 3 Aug 2017

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