Journal Article

PUBDB-2022-06289

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Disentangling sequential and concerted fragmentations of molecular polycations with covariant native frame analysis

McManus, J. W. ; Walmsley, T. ; Nagaya, K. ; Harries, J. R. ; Kumagai, Y. ; Iwayama, H. ; Ashfold, M. N. R. ; Britton, M. ; Bucksbaum, P. H. ; Downes-Ward, B. ; Driver, T. ; Heathcote, D. ; Hockett, P. ; Howard, A. J. ; Kukk, E. ; Lee, J. W. L.Extern*DESY* ; Liu, Y. ; Milesevic, D. ; Minns, R. S. ; Niozu, A. ; Niskanen, J. ; Orr-Ewing, A. J. ; Owada, S. ; Rolles, D.Extern* ; Robertson, P. A. ; Rudenko, A. ; Ueda, K. ; Unwin, J. ; Vallance, C. ; Burt, M. ; Brouard, M. ; Forbes, R. ; Allum, F. (Corresponding author)

2022
RSC Publ. Cambridge

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Please use a persistent id in citations: doi:10.1039/D2CP03029B  doi:10.3204/PUBDB-2022-06289

Abstract: We present results from an experimental ion imaging study into the fragmentation dynamics of 1-iodopropane and 2-iodopropane following interaction with extreme ultraviolet intense femtosecond laser pulses with a photon energy of 95 eV. Using covariance imaging analysis, a range of observed fragmentation pathways of the resulting polycations can be isolated and interrogated in detail at relatively high ion count rates (∼12 ions shot$^{−1}$). By incorporating the recently developed native frames analysis approach into the three-dimensional covariance imaging procedure, contributions from three-body concerted and sequential fragmentation mechanisms can be isolated. The angular distribution of the fragment ions is much more complex than in previously reported studies for triatomic polycations, and differs substantially between the two isomeric species. With support of simple simulations of the dissociation channels of interest, detailed physical insights into the fragmentation dynamics are obtained, including how the initial dissociation step in a sequential mechanism influences rovibrational dynamics in the metastable intermediate ion and how signatures of this nuclear motion manifest in the measured signals.

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Contributing Institute(s):

1. Spectroscopy of molecular processes (FS-SMP)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2022

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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