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Tracing charge transfer in argon dimers by XUV-pump IR-probe experiments at FLASH

Authors :
Lorenz S. Cederbaum
Claus Dieter Schröter
Thomas Pfeifer
Mathieu Gisselbrecht
Alexander I. Kuleff
Rolf Treusch
Tsveta Miteva
Kirill Gokhberg
Georg H. Schmid
Robert Moshammer
Hannes Carsten Lindenblatt
Stefan Düsterer
Harald Redlin
Yifan Liu
Kirsten Schnorr
Severin Meister
Florian Trost
Sven Augustin
Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR)
Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Source :
Journal of Chemical Physics, Journal of Chemical Physics, American Institute of Physics, 2019, 151 (8), pp.084314. ⟨10.1063/5.0009264⟩, The journal of chemical physics 151(8), 084314-(2019). doi:10.1063/1.5116234
Publication Year :
2019
Publisher :
HAL CCSD, 2019.

Abstract

Charge transfer (CT) at avoided crossings of excited ionized states of argon dimers is observed using a two-color pump-probe experiment at the free-electron laser in Hamburg (FLASH). The process is initiated by the absorption of three 27-eV-photons from the pump pulse, which leads to the population of Ar2+*–Ar states. Due to nonadiabatic coupling between these one-site doubly ionized states and two-site doubly ionized states of the type Ar+*–Ar+, CT can take place leading to the population of the latter states. The onset of this process is probed by a delayed infrared (800 nm) laser pulse. The latter ionizes the dimers populating repulsive Ar2+ –Ar+ states, which then undergo a Coulomb explosion. From the delay-dependent yields of the obtained Ar2+ and Ar+ ions, the lifetime of the charge-transfer process is extracted. The obtained experimental value of (531 ± 136) fs agrees well with the theoretical value computed from Landau-Zener probabilities.

Details

Language :
English
ISSN :
00219606 and 10897690
Database :
OpenAIRE
Journal :
Journal of Chemical Physics, Journal of Chemical Physics, American Institute of Physics, 2019, 151 (8), pp.084314. ⟨10.1063/5.0009264⟩, The journal of chemical physics 151(8), 084314-(2019). doi:10.1063/1.5116234
Accession number :
edsair.doi.dedup.....ef4337c6542c732cfc581153fa2cfa8a