Dynamics of CS（A¹Π） Formation in the Energy Transfer Reaction Ar(³P_0.2)+CS₂（\tilde X^1¹Σ_g⁺）

The CS（A¹Π→X¹Σ⁺） fluorescence spectra resulting from the energy transfcr reaction Ar(³P_0.2)+CS₂ under the single collision condition have been obtained. The relative vibrational populations of the nascant product CS（A¹Π,v’）have benn determined by means of curve fitting: N₀:N₁:N₂:N₃:N₄:N₅:N₆=1:1.35:1.57:1.17:0.78:0.61:0.49. A population inversion is found at v’=2. The population data are approximately represented by a distribution predicted from Impulsive Half-Collision Model. The dynamics of CS（A¹Π） formation has been discussed in detail. It is pointed out that the vibrational populations of CS（A¹Π） produced from collision-induced dissociative excitation of CS₂ do not fit with the results from golden rule calculations.