LASER-INDUSED PHOSPHORESCENCE OF $SO_{2}$ IN SOLID NEON: DIRECT OBSERVATION OF THE $b^{3} A_{2}$ STATE
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Date
1997
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Ohio State University
Abstract
Dispersed phosphorescence spectra of the transition a $^{3}B_{1} - X ^{1}A_{1}$ of $^{18}O$-labled $SO_{2}$ in solid Ne were recorded in the spectral region 388-478 nm during laser excitation. As zero-phonon lines are well resolved, we were able to identify all three vibrational modes of the $X^{1} A_{1}$ state, and to monitor emission from a specific isotopomer (in particular $^{16}OS^{18}O)$ to obtain its corresponding excitation spectra. The vibronic patterns of excitation spectra of $S^{16}O_{2}$ and $S^{18}O_{2}$ in the spectral range 351-388 nm are similar to those observed in the gaseous phase, with severely perturbed lines above $a^{3}B_{1}$ (110) at $27005 cm^{-1}$. New lines in two groups were observed for $^{16}OS^{18}O$; they are identified as lines associated with the $\nu_{3}$ of $a^{3} B_{1}$ and of $b^{3} A_{2}$. These observations enable us to report $\nu_{3} = 922 cm^{-1}$ for $a^{3} B_{1}, \nu_{2} = 315$ and $\nu_{1} = 771 cm^{-1}$ for $b^{3}A_{2}$, and a false origin at $26653 cm^{-1}$ for the $b^{3} A_{2} (001) - X^{1} A_{1} (000)$ transition of $^{16}OS^{18}O$.
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Author Institution: Department of Chemistry, National Tsing Hua University; Department of Chemistry, The University of British Columbia