Charge-induced chemical dynamics in glycine probed with time-resolved Auger electron spectroscopy.
Journal
Structural dynamics (Melville, N.Y.)
ISSN: 2329-7778
Titre abrégé: Struct Dyn
Pays: United States
ID NLM: 101660872
Informations de publication
Date de publication:
Nov 2022
Nov 2022
Historique:
received:
28
06
2022
accepted:
17
10
2022
entrez:
17
11
2022
pubmed:
18
11
2022
medline:
18
11
2022
Statut:
epublish
Résumé
In the present contribution, we use x-rays to monitor charge-induced chemical dynamics in the photoionized amino acid glycine with femtosecond time resolution. The outgoing photoelectron leaves behind the cation in a coherent superposition of quantum mechanical eigenstates. Delayed x-ray pulses track the induced coherence through resonant x-ray absorption that induces Auger decay. Temporal modulation of the Auger electron signal correlated with specific ions is observed, which is governed by the initial electronic coherence and subsequent vibronic coupling to nuclear degrees of freedom. In the time-resolved x-ray absorption measurement, we monitor the time-frequency spectra of the resulting many-body quantum wave packets for a period of 175 fs along different reaction coordinates. Our experiment proves that by measuring specific fragments associated with the glycine dication as a function of the pump-probe delay, one can selectively probe electronic coherences at early times associated with a few distinguishable components of the broad electronic wave packet created initially by the pump pulse in the cation. The corresponding coherent superpositions formed by subsets of electronic eigenstates and evolving along parallel dynamical pathways show different phases and time periods in the range of
Identifiants
pubmed: 36389279
doi: 10.1063/4.0000165
pii: 4.0000165
pmc: PMC9646253
doi:
Types de publication
Journal Article
Langues
eng
Pagination
064301Informations de copyright
© 2022 Author(s).
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