FLUORESCENCE SPECTROSCOPY OF PREDISSOCIATED LEVELS OF ELECTRONICALLY EXCITED $S_{2}$
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Date
1988
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Ohio State University
Abstract
We have re-examined the laser induced fluorescence spectrum of jet-cooled S2. In the range of 31.000 to $35.500 cm^{-1}$ the spectrum shows intense bands of the wellknown $B^{3}\Sigma- X^{3}\Sigma_{g}$ system, and weaker features which belong to the $B^{-3}\pi_{u}-X^{3}\Sigma^{-}_{g}$ transition. Predissocation to ground state atoms causes a breaking off of the emissions from both bands at energies above $35,570 cm^{-1}$. However, we have now observed fluorescence from three fragmentary bands which lie at energies above the predissociation limit. One of these features is readily identified as the B-X, 10.0 band. Rotational analysis yields the constants $v_{o}=35,702.34.\lambda=1.3$ and $B_{10}=0.133 cm^{-1}$. The two other bands, which have origins at 35,668.54 and $35,723.84 cm^{-1}$ are not part of the B-X system. The former shows P.Q. and R branches, and rotational perturbations which affect only the Q branch. The higher energy band has only P and R branches. The analyses of these fragmentary structures will be discussed.
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Author Institution: Department of Chemistry, Emory University