Lifetimes for two selectively excited levels of the B3Σu− state of gaseous diatomic sulfur have been measured using the Hanle effect. The ZnI 3075.9 Å line overlaps the P 1(41) absorption line of the (4, 1) band of the B -X transition, and the CdI 3261.1 Å line overlaps the P 1(43) line of the (3, 3) band. We assume a magnetic moment for the B state calculated using a nonzero spin-spin interaction constant to obtain lifetimes of 18.3 ± 1.4 nsec for the ν′ = 4, N′ = 40, J′ = 41 level, and 20.7 ± 1.4 nsec for the ν′ = 3, N′ = 42, J′ = 43 level (quoted errors are 2σ estimates derived from the errors in the experimental data only).
Measurements have been made on the intensities of rotational satellites (AN # AJ) in selectively excited fluorescence in the B-X system of S2. The satellites appear in fluorescence emitted by the u' = 4 level but are absent in u' = 3 emission. Comparison of our results with line strengths calculated according to the formulation of Tatum and Watson shows that these two adjacent vibrational levels differ in the magnitude and sign of the triplet splitting constant. A reexamination of previous spectral analyses of the B-X system confirms this variation in coupling among B-state vibrational levels.On a mesure les intensites des satellites de rotation (AN # AJ) dans la fluorescence excitee selectivement dans le systeme B-X de S2. Ces satellites apparaissent dans la fl~~orescence Cmise par le niveau u' = 4, mais sont absentes dans I'emission u' = 3. La comparaison de nos risultats avec les intensites calculCes conformement a la formulation de Tatum et Watson montre que ces deux niveaux de vibration adjacents different quant au signe et a la grandeur de la constante de separation triplet. L'examen des analyses antirieures du systeme B-Xconfirnme cette variation de couplage pour les niveaux de vibrations de 1'Ctat B.[Traduit par le journal]Can.
Franck-Condon factors, for transitions connecting the ν′ = 3 and ν′ = 4 vibrational levels of the B 3Σu− state of S2 to the ground X 3Σg− state, have been measured using selective excitation of resonance fluorescence. Observation of all ν″ terms for each ν′ allows a determination of the Franck-Condon factors without arbitrary normalization. Comparison of our results with theoretical predictions shows disagreement; this is not unexpected due to the extensive perturbations in the B state.
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