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



Publication Details
Authors:
Glass-Maujean, M.; Klumpp, S.; Werner, L.; Ehresmann, A.; Schmoranzer, H.
Publication year:
2008
Journal:
Journal of Chemical Physics
Pages range:
094312
Volume number:
128
ISSN:
0021-9606

Abstract
The absorptionspectrum of the H2 molecule was studied at high resolution in the 81-72nm spectral range. A detailed analysis of the D′1Πu→X1Σ+g electronic band system is reported. In the spectrum, more than 70 new lines were assigned. For wavelengths longer than 75nm, the D′1Π+u and 1Π-u components show a clearly different behavior: Τhe 1Π+u one dissociates into H(1s) + H(n=2) whereas the 1Π-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.


Research Areas


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