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Title: THE $A\leftarrow X$ TRANSITION OF $SO_{2}$ - S. V. L. FLUORESCENCE
Creators: O'Dwyer, M. F.; Shaw, R. J.; Kent, J. E.
Issue Date: 1979
Publisher: Ohio State University
Abstract: Many studies of the $A \leftarrow X$ transition of $SO_{2}$ have been reported. A clear picture of the nature of the excited state involved is not evident. This work involves an approach to this problem through the technique of single vibronic level fluorescence spectra. Over one hundred of these have been recorded in the wavelength region from 3280 {\AA} to 2940 {\AA} using a dye laser as excitation source. The fluorescence spectra show $n\nu_{1}$ progressions (n = 5 or greater) with Franck-Condon patterns that are very similar for regions of the excitation frequency of nearly $700 cm^{-1}$. when the excitation energy is moved up, the pattern changes to another distinct pattern, that again persists for about $700 cm^{-1}$. This behaviour continues for five regions. The $n\nu_{2}$ progressions are essentilally absent in the lowest energy excitation spectra and then slowly increase in length as the excitation energy increase. There is limited activity in both even and odd quanta of $\nu_{3}$. The interpretation is that $^{1}B_{1}$ state (with zero-order origin at $\sim 31,240$ $cm^{-1}$) is very strongly vibronicaly mixed with $^{1}A_{2}$ levels (with much lower energy zero-order origin). The bulk of the emission is what would be expected from the zero-order $^{1}B_{1}$ levels, with that characteristic of the $^{1}A_{2}$ components of the mixed levels having contributions of varying phases and thus tending to cancel.
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Other Identifiers: 1979-TB-03
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