A1 Refereed original research article in a scientific journal
Sequential multiple ionization and fragmentation of SF6 induced by an intense free electron laser pulse
Authors: T Osipov, L Fang, B Murphy, F Tarantelli, E R Hosler, E Kukk, J D Bozek, C Bostedt, E P Kanter, N Berrah
Publisher: IOP PUBLISHING LTD
Publishing place: BRISTOL; TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Publication year: 2013
Journal: Journal of Physics B: Atomic, Molecular and Optical Physics
Journal name in source: Journal of Physics B-Atomic Molecular and Optical Physics
Journal acronym: J.Phys.B-At.Mol.Opt.Phys.
Number in series: 16
Volume: 46
Issue: 16
First page : 164032
Last page: 164032
Number of pages: 7
ISSN: 0953-4075
DOI: https://doi.org/10.1088/0953-4075/46/16/164032
We investigate the multiphoton ionization and the subsequent fragmentation of SF6 molecules with intense x-ray-free electron laser pulses at different photon energies. We observe highly charged molecular and atomic ions which were absent in previous experiments with conventional x-ray sources. The observation of fully stripped fluorine ions suggests sequential multiphoton ionization processes with intermediate 1s electron excitation. We measure the average momentum and kinetic energy of each fragment, the comparison of which implies many-body fragmentation pathways of the molecular ions. The observed non-monotonic dependence of the kinetic energy on the charge states of fluorine indicates the multiphoton ionization of 'isolated' atomic neutral fluorine or fluorine ions resultant from bond cleavages and also implies the fragmentation of highly charged molecular ions that are produced at a later time during a single pulse.
