TITLE

Fluorescence lifetimes of EF 1Σ+g, GK 1Σ+g, H 1Σ+g, I 1Πg, and J 1Δg states of H2 studied by extreme ultraviolet–visible double resonance excitation

AUTHOR(S)
Tsukiyama, Koichi; Ishii, Juntarou; Kasuya, Takahiro
PUB. DATE
July 1992
SOURCE
Journal of Chemical Physics;7/15/1992, Vol. 97 Issue 2, p875
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Extreme ultraviolet–visible double resonance excitation has been employed to populate the EF 1Σ+g, GK 1Σ+g, H 1Σ+g, I 1Πg, and J 1Δg states of hydrogen molecules in the range between 111 500 and 114 000 cm-1. Tunable coherent extreme ultraviolet radiation prepared H2 in the B 1Σ+u (v=5, J) state. The visible laser radiation subsequently brought H2 to higher gerade states. Term values were determined for the J’=0–4 levels, which confirmed the systematic error of 8.01±0.03 cm-1 in the previous analysis by Dieke. The single rovibronic fluorescence lifetimes were measured under a collision-free condition. The fluorescence lifetimes of the I 1Πg(v’ = 0) and J 1Δg(v’ = 0) states, ∼20 and 25 ns, respectively, were found to depend little on the rotational levels. The EF 1Σ+g, GK 1Σ+g, and H 1Σ+g states, on the other hand, exhibited significant rotational dependence. The nonadiabatic coupling among the upper gerade manifolds explained the observed rotational dependence successfully.
ACCESSION #
7639719

 

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