Abstract
Quantum interference effect (QIE) in rotational energy transfer within CO ( A 1 Π, v=0/ e 3 Σ −, v=1 ) mixed states in collision with HCl are observed with the interference phase angle θ ST of 101 and 110° for Δ J=±1 transition, respectively, from the initial J=12 and 13 states. In comparison with the previous similar experiments with He et al. as collision partner, which all give a θ ST<90°, the interference for a same CO transition in collision with HCl changes from constructive to destructive or the reverse since cos θ ST becomes negative. The bigger θ ST may be explained by the long-range dipole–dipole interaction of proportional to R −3. The physical significance of θ ST is discussed in some details.
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