Abstract

Vibrational fluorescence from V=2 to V=1 state is observed following excitation by a pulsed HCl chemical laser. The time dependence of the fluorescence is used to determine the rate of near-resonant vibration-to-vibration energy transfer, HCl(V=1)+HCl(V=1)⇄HCl(V=2)+HCl(V=0)+Δ E=104 cm−1. The cross section for this reaction in the exothermic direction at room temperature has been found to be 0.73± 0.15× 10−16 cm−2.

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