Ultrafast dynamics of the ns (n = 3,4) and 3d Rydberg states of O2

The ultrafast dynamics of the lowest optically accessible Rydberg states of molecular oxygen (O 2 ) has been studied by time resolved transient ionization. The process was triggered by the absorption of two pump photons in the 304 nm-220 nm range which corresponds to an energy range of 8.2 eV-11.3 e...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2013-04, Vol.15 (14), p.4914-492
Main Authors: Conde, A. Peralta, Montero, R, Ovejas, V, Fernández-Fernández, M, Castaño, F, Longarte, A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Molecular Dynamics Simulation
Oxygen - chemistry
Photons
Time Factors
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Summary:The ultrafast dynamics of the lowest optically accessible Rydberg states of molecular oxygen (O 2 ) has been studied by time resolved transient ionization. The process was triggered by the absorption of two pump photons in the 304 nm-220 nm range which corresponds to an energy range of 8.2 eV-11.3 eV, and probed by ionization with photons at 800 nm. From the analysis of the experimental data different time constants ranging from a few femtoseconds to hundreds of picoseconds were found. The identification of the states responsible for the measured lifetimes revealed important facts about the dynamics of the Rydberg states in this energy range, underlying the importance of the coupling between Rydberg and valence states in the relaxation mechanisms of the molecule. First time-resolved study of the lowest optically accessible Rydberg states of O 2 .
ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp44380a