ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
A Doppler-free polarization spectrum of the D 1Σ+u(v',J')–X 1Σ+g(v‘,J‘) transition has been observed, and the molecular constants of the D 1Σ+u state were determined. A remarkable variation of the vibrational spacing ΔGv with v', and large deviations of ΔGv from the fitted ΔGv curve for v'(approximately-greater-than)35 were analyzed. The potential curve of the perturbing state, which was identified as the bound (2)3Πu state, was estimated. By using an experimental setup where a collimated cesium beam is crossed at right angles by the laser beam, we measured the excitation spectra by monitoring separately the molecular fluorescence and the D2 or D1 atomic emission. We found that a predissociation of the D 1Σ+u state occurred for v'(approximately-greater-than)20, and the probability of predissociation increased with v'. The measured v' and J' dependence of the linewidth Γ showed a significant increase for v'(approximately-greater-than)25. The predissociation of the D 1Σ+u state is caused by a combination of spin–orbit interaction between the D 1Σ+u(v'J') and (2)3Π0u(e vJ') levels, and the L-uncoupling interaction between the bound (2)3Π0u(e vJ') and dissociative c 3Σ+u(N = J'J') levels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.460690
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