University of Oulu

Kukk, E., Myllynen, H., Nagaya, K., Wada, S., Bozek, J., Takanashi, T., You, D., Niozu, A., Kooser, K., Gaumnitz, T., Pelimanni, E., Berholts, M., Granroth, S., Yokono, N., Fukuzawa, H., Miron, C., Ueda, K. (2019) Coulomb implosion of tetrabromothiophene observed under multiphoton ionization by free-electron-laser soft-x-ray pulses. Physical review A, 99 (2), 023411. doi:10.1103/PhysRevA.99.023411

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

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Author: Kukk, E.1,2; Myllynen, H.1; Nagaya, K.3;
Organizations: 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
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
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Language: English
Published: American Physical Society, 2019
Publish Date: 2019-06-13


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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Series: Physical review. A
ISSN: 2469-9926
ISSN-E: 2469-9934
ISSN-L: 2469-9926
Volume: 99
Article number: 023411
DOI: 10.1103/PhysRevA.99.023411
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This study was supported by the X-ray Free Electron Laser Utilization Research Project and the X-ray Free Electron Laser Priority Strategy Program of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), by the Proposal Program of SACLA Experimental Instruments of RIKEN, by the research program “Dynamic alliance for open innovation bridging human, environment and materials” in Network Joint Research Center for Materials and Devices, by IMRAM project, and by the Japan Society for the Promotion of Science. E.K. and E.P. acknowledge financial support from the Academy of Finland and D.Y. acknowledges support from a Grant-in-Aid of Tohoku University Institute for Promoting Graduate Degree Programs, Division for Interdisciplinary Advanced Research and Education. M.B. acknowledges financial support from the ASTRA project PER ASPERA Graduate School of Functional Materials and Technologies receiving funding from the European Regional Development Fund under a project at University of Tartu, Estonia
Copyright information: ©2019 American Physical Society.