The study of the D′ 1Πu state of H2:: Transition probabilities from the ground state, predissociation yields, and natural linewidths

被引:29
作者
Glass-Maujean, M. [1 ]
Klumpp, S. [2 ]
Werner, L. [2 ]
Ehresmann, A. [2 ]
Schmoranzer, H. [3 ]
机构
[1] Univ Paris 06, CNRS, Lab Phys Mol Atmosphere & Astrophys, F-75252 Paris 05, France
[2] Univ Kassel, Inst Phys, D-34132 Kassel, Germany
[3] Tech Univ Kaiserlautern, Fachbereich Phys, D-67653 Kaiserslautern, Germany
关键词
D O I
10.1063/1.2835006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The absorption spectrum of the H-2 molecule was studied at high resolution in the 81-72 nm spectral range. A detailed analysis of the D' (1)Pi(u)-> X (1)Sigma(+)(g) electronic band system is reported. In the spectrum, more than 70 new lines were assigned. For wavelengths longer than 75 nm, the D' (1)Pi(+)(u) and (1)Pi(-)(u) components show a clearly different behavior: Tau he (1)Pi(+)(u) one dissociates into H(1s)+H(n=2) whereas the (1)Pi(-)(u) one leads to molecular fluorescence. For shorter wavelengths, both components are predissociated into H(1s)+H(n=3). The predissociation yields, the dissociation widths, and the absolute values of the transition probabilities were measured over the vibrational progression from v'=3 to 17, i.e., up to the dissociation limit. The comparison between these absolute transition probabilities and the values calculated in the adiabatic and nonadiabatic approximations demonstrates clearly the importance of nonadiabatic couplings.
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页数:9
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