Vibrational relaxation of D2 in 3He and 4He mixtures

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Abstract
The rates of vibrational relaxation of D2 in 3He and 4He mixtures have been studied by the laser‐induced vibrational fluorescence technique. The relaxation rates of HCl/D2/3He and HCl/D2/4He mixtures at 296°K show cross sections of V → T, R energy transfer as σD2−4He = 9.5 ± 1.1 × 10−23 cm2, σD2−3He = 12.5 ± 1.5 × 10−23 cm2 . These measured cross sections should provide an ideal test for existing scattering theory calculations.

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