Laser induced combination band fluorescence study of vibrational deactivation of ethylene in C2H4-X mixtures

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Abstract
Laser induced fluorescence studies of vibrational deactivation of C2H4 in mixtures with rare gases and diatomic molecules have been made. The experimental results are compared with predictions based on simple vibration‐translation and vibration‐rotation energy transfer theories. The data is consistent with V‐T deactivation of ethylene by light collision partners. For heavy collision partners the experimental results cannot be reasonably described using standard V‐T theory. The qualitative trends in the deactivation probability for the heavy collision partners are in the direction predicted by simple, semiempirical V‐R calculations.