The Role of Momentum Partitioning in Covariance Ion Imaging Analysis

We present results from a covariance ion imaging study, which employs extensive filtering, on the relationship between fragment momenta to gain deeper insight into photofragmentation dynamics. A new data analysis approach is introduced that considers the momentum partitioning between the fragments o...

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Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2024-05, Vol.128 (22), p.4548-4560
Main Authors: Walmsley, Tiffany, McManus, Joseph W., Kumagai, Yoshiaki, Nagaya, Kiyonobu, Harries, James, Iwayama, Hiroshi, Ashfold, Michael N. R., Britton, Mathew, Bucksbaum, Philip H., Downes-Ward, Briony, Driver, Taran, Heathcote, David, Hockett, Paul, Howard, Andrew J., Lee, Jason W. L., Liu, Yusong, Kukk, Edwin, Milesevic, Dennis, Minns, Russell S., Niozu, Akinobu, Niskanen, Johannes, Orr-Ewing, Andrew J., Owada, Shigeki, Robertson, Patrick A., Rolles, Daniel, Rudenko, Artem, Ueda, Kiyoshi, Unwin, James, Vallance, Claire, Brouard, Mark, Burt, Michael, Allum, Felix, Forbes, Ruaridh
Format: Article
Language:English
Subjects:
A: New Tools and Methods in Experiment and Theory
Bond cleavage
Dissociation
Fragmentation
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ionization
Ions
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Summary:We present results from a covariance ion imaging study, which employs extensive filtering, on the relationship between fragment momenta to gain deeper insight into photofragmentation dynamics. A new data analysis approach is introduced that considers the momentum partitioning between the fragments of the breakup of a molecular polycation to disentangle concurrent fragmentation channels, which yield the same ion species. We exploit this approach to examine the momentum exchange relationship between the products, which provides direct insight into the dynamics of molecular fragmentation. We apply these techniques to extensively characterize the dissociation of 1-iodopropane and 2-iodopropane dications prepared by site-selective ionization of the iodine atom using extreme ultraviolet intense femtosecond laser pulses with a photon energy of 95 eV. Our assignments are supported by classical simulations, using parameters largely obtained directly from the experimental data.
ISSN:1089-5639
1520-5215
DOI:10.1021/acs.jpca.4c00999