Abstract
Rate constants have been obtained for rotational and vibrational energy transfer within the A 2Δ state of CH by collisions with Ar and N2. By using laser photolysis of CHBr3 as the source of CH(A), it was possible to produce a wide range of rotational and vibrational levels (N⩽ 25, v⩽ 2). The rate constants for rotational relaxation are comparable to gas kinetic rates (k < 2.5 × 10–10 cm3 molecule–1 s–1) and decrease with increasing rotational quantum number. The efficiency of vibrational relaxation is ca. 10 times less than that of rotational relaxation (k < 6.5 × 10–12 cm3 molecule–1 s–1).
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