DOE OSTI · 2561419
State selectivity in core ionization of methane
Abstract
A clear experimental signature of the population of the lowest triplet state T 1 3 of the methane dication is identified in a photoionization experiment. This state is populated only in valence ionization and is absent when the dication is formed by core ionization followed by Auger-Meitner decay. For valence ionization, the total internal energy of the CH 3 + fragment, formed during the deprotonation of CH 4 2 + , is evaluated. Notably, the distribution of this internal energy peaks at the same value regardless of the initially populated electronic state of CH 4 2 + . We find that excited electronic states of CH 3 + are predominantly populated with significant rovibrational excitation. Published by the American Physical Society 2025
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Rajput, J. (ORCID:0000000157752543), Stindl, J. (ORCID:0000000250412404), Cassimi, A. (ORCID:0000000233674066), Gervais, B., Kircher, M. (ORCID:0000000215925706), Kastirke, G., McGinnis, O. D. (ORCID:0000000314021593), Enoki, R. (ORCID:0009000948245852), Williams, J. B., Davis, V. (ORCID:0000000247706348), Saha, R. (ORCID:0000000178415335), Kumar, S. (ORCID:0000000219969925), Kostko, O. (ORCID:0000000320684991), Shaikh, M. (ORCID:0000000239689007), Weber, Th. (ORCID:0000000337562704), Slaughter, D. S. (ORCID:0000000246214552), Iwamoto, N., Bagdia, C., Ben-Itzhak, I., Schöffler, M. S. (ORCID:0000000192146848), Safvan, C. P. (ORCID:0000000184298956). 2025-04-22. State selectivity in core ionization of methane. https://doi.org/10.1103/physrevresearch.7.l022021
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