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Imaging Ultrafast Dissociation Dynamics: OCS & Roaming in Formaldehyde by Tomoyuki Endo; Simon P. Neville; Karl Michael Ziems; Philippe Lassonde; Chen Qu; Bruno E. Schmidt; Hikaru Fujise; Mizuho Fushitani; Akiyoshi Hishikawa; Stefanie Gräfe; Paul L. Houston; Joel M. Bowman; Michael S. Schuurman; François Légaré; Heide Ibrahim is a book available to read on EtoBox.

What is Imaging Ultrafast Dissociation Dynamics: OCS & Roaming in Formaldehyde about?

## Abstract Upon photoexcitation, molecules break apart, following different dissociation reactions. We can image these dissociation pathways using Coulomb explosion imaging (CEI) and sometimes we can control them using asymmetric laser fields. In the formaldehyde molecule, we can see fragments following the direct, conventional dissociation path, as well as fragments deviating from this minimum energy path. So-called roaming fragments or “roamers” explore the potential energy landscape in a statistical manner and could be directly captured in real-time, despite the signal’s statistical character. This is possible due to the single-molecule sensitivity of CEI and we could show that the onset of roaming occurs actually several orders of magnitude earlier than previously expected. In the polar molecule OCS we go one step further by controlling the fragmentation process using two-color asymmetric laser fields. In addition to expected direct ionization effects, we also see post-ionization contributions, which are usually not visible in heavy polar molecules. We thus show in two different examples that CEI provides the means to extract new, unexpected pathways, which would otherwise rem

Author

Tomoyuki Endo; Simon P. Neville; Karl Michael Ziems; Philippe Lassonde; Chen Qu; Bruno E. Schmidt; Hikaru Fujise; Mizuho Fushitani; Akiyoshi Hishikawa; Stefanie Gräfe; Paul L. Houston; Joel M. Bowman; Michael S. Schuurman; François Légaré; Heide Ibrahim

Publisher

Springer International Publishing AG

Published

2024

Language

EN

ISBN

9783031479373

Subjects

Science, Chemistry, Engineering