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Time-resolved site-selective imaging of predissociation and charge transfer dynamics: The CH3I B-band
Authors
Felix Allum
Sadia Bari
+21 more
Rebecca Boll
Kurtis Borne
Mark Brouard
Philip H. Bucksbaum
Michael Burt
Nagitha Ekanayake
Benjamin Erk
Ruaridh Forbes
Andrew J. Howard
Per Johnsson
Jason W.L. Lee
Bastian Manschwetus
Robert Mason
Christopher Passow
Jasper Peschel
Daniel E. Rivas
Daniel Rolles
Arnaud Rouzée
Aljoscha Rörig
Claire Vallance
Farzaneh Ziaee
Publication date
1 January 2020
Publisher
Bristol : IOP Publ.
Doi
Cite
Abstract
The predissociation dynamics of the 6s (B2E) Rydberg state of gas-phase CH3I were investigated by time-resolved Coulomb-explosion imaging using extreme ultraviolet (XUV) free-electron laser pulses. Inner-shell ionization at the iodine 4d edge was utilized to provide a site-specific probe of the ensuing dynamics. The combination of a velocity-map imaging (VMI) spectrometer coupled with the pixel imaging mass spectrometry (PImMS) camera permitted three-dimensional ionic fragment momenta to be recorded simultaneously for a wide range of iodine charge states. In accord with previous studies, initial excitation at 201.2 nm results in internal conversion and subsequent dissociation on the lower-lying A-state surface on a picosecond time scale. Examination of the time-dependent yield of low kinetic energy iodine fragments yields mechanistic insights into the predissociation and subsequent charge transfer following multiple ionization of the iodine products. The effect of charge transfer was observed through differing delay-dependencies of the various iodine charge states, from which critical internuclear distances for charge transfer could be inferred and compared to a classical over-the-barrier model. Time-dependent photofragment angular anisotropy parameters were extracted from the central slice of the Newton sphere, without Abel inversion, and highlight the effect of rotation of the parent molecule before dissociation, as observed in previous © 2020 The Author(s). Published by IOP Publishing Ltd Printed in the U
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Last time updated on 23/07/2022