Aufsatz in einer Fachzeitschrift
The study of the D′¹Πu state of H₂: Transition probabilities from the ground state, predissociation yields, and natural linewidths
Details zur Publikation
Autor(inn)en: | Glass-Maujean, M.; Klumpp, S.; Werner, L.; Ehresmann, A.; Schmoranzer, H. |
Publikationsjahr: | 2008 |
Zeitschrift: | The Journal of Chemical Physics |
Seitenbereich: | 094312 |
Jahrgang/Band : | 128 |
ISSN: | 0021-9606 |
URN / URL: |
Zusammenfassung, 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.
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.
