State selectivity in core ionization of methane
A clear experimental signature of the population of the lowest triplet state ^{3}T_{1} 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 deca...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2025-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.L022021 |
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| Summary: | A clear experimental signature of the population of the lowest triplet state ^{3}T_{1} 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. |
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| ISSN: | 2643-1564 |