Coulomb implosion of tetrabromothiophene observed under multiphoton ionization by free-electron-laser soft-x-ray pulses

E. Kukk, H. Myllynen, K. Nagaya, S. Wada, J. D. Bozek, T. Takanashi, D. You, A. Niozu, K. Kooser, T. Gaumnitz, E. Pelimanni, M. Berholts, S. Granroth, N. Yokono, H. Fukuzawa, C. Miron, and K. Ueda
Phys. Rev. A 99, 023411 – Published 11 February 2019
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Abstract

Soft-x-ray free-electron-laser pulses were used to create highly charged molecular tetrabromothiophene species by sequential multiphoton ionization from bromine 3d orbitals. The experiment was performed at the SACLA facility in Japan and the products of molecular dissociation were analyzed by means of multicoincidence momentum-resolved ion time-of-flight spectroscopy. Total charge states up to +13 atomic units were produced, creating a particular dissociation pattern for the carbon ions, a Coulomb implosion, due to the concerted forces by the surrounding heavy bromine ions. This behavior was explored both experimentally and by numerical molecular-dynamics simulations and the fingerprints of the Coulomb implosion were identified in both. In simulations, Coulomb implosion was predicted to be highly sensitive to the initial (thermal) motion of the atoms and, after including vibrational motion for several temperatures, good general agreement between the experiment and simulations was found. The agreement with the experiment was further improved by adding charge dynamics to the simulation, according to our point-charge dynamics model with empirical rate constants.

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  • Received 1 October 2018

DOI:https://doi.org/10.1103/PhysRevA.99.023411

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

E. Kukk1,2, H. Myllynen1, K. Nagaya3, S. Wada4, J. D. Bozek5, T. Takanashi2, D. You2, A. Niozu3, K. Kooser1, T. Gaumnitz6, E. Pelimanni7, M. Berholts1, S. Granroth1, N. Yokono3, H. Fukuzawa2,8, C. Miron9, and K. Ueda2,8

  • 1Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
  • 2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • 3Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 4Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • 5Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
  • 6Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
  • 7Nano and Molecular Systems Research Unit, Faculty of Science, 90014 University of Oulu, Finland
  • 8RIKEN SPring-8 Center, Kouto 1-1-1, Sayo, Hyogo 679-5148, Japan
  • 9LIDYL, CEA, CNRS, Université Paris–Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France

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Issue

Vol. 99, Iss. 2 — February 2019

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