CS(A 1Π→X 1Σ+) fluorescence from photodissociation of CS2 and OCS

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Abstract
The CS(A 1Π→X 1Σ+) fluorescence resulting from photodissociation of CS2 and OCS by vacuum ultraviolet emission lines extending from λλ686–1239 Å has been investigated. With the assumption that the electronic transition moment is constant, the Franck–Condon factors for the emission system and the populations of the vibrational levels of the CS(A 1Π) electronic state have been determined. The population data are approximately represented by a Poisson distribution, which is predicted from a theoretical model. A population inversion between the v=0 and 1 levels of the CS(A 1Π) state is found. The cross sections for the production of fluorescence are also presented.