[en] The ultrafast structural, Jahn–Teller (JT) driven, electronic coherence mediated quantum dynamics in the CH4+ and CD4+ cations that follows sudden ionization using an XUV attopulse exhibits a strong isotope effect. The JT effect makes the methane cation unstable in the Td geometry of the neutral molecule. Upon the sudden ionization the cation is produced in a coherent superposition of three electronic states that are strongly coupled and neither is in equilibrium with the nuclei. In the ground state of the cation the few femtosecond structural rearrangement leads first to a geometrically less distorted D2d minimum followed by a geometrical reorganization to a shallow C2v minimum. The dynamics is computed for an ensemble of 8000 ions randomly oriented with respect to the polarization of the XUV pulse. The ratio, about 3, of the CD4+ to CH4+ autocorrelation functions, is in agreement with experimental measurements of high harmonic spectra. The high value of the ratio is attributed to the faster electronic coherence dynamics in CH4+.
Research center :
MolSys - Molecular Systems - ULiège
Disciplines :
Chemistry
Author, co-author :
Gonçalves, Cayo ; Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique
Levine, R. D.
Remacle, Françoise ; Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique
Language :
English
Title :
Ultrafast geometrical reorganization of a methane cation upon sudden ionization: an isotope effect on electronic non-equilibrium quantum dynamics
Publication date :
2021
Journal title :
Physical Chemistry Chemical Physics
ISSN :
1463-9076
eISSN :
1463-9084
Publisher :
Royal Society of Chemistry, United Kingdom
Volume :
23
Issue :
21
Pages :
12051-12059
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] CÉCI - Consortium des Équipements de Calcul Intensif [BE] COST - European Cooperation in Science and Technology [BE]
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