The semirigid vibrating rotor target model is applied to study the isotope effect in reaction using time-dependent wave-packet method. The reaction probabilities for producing and HD product channels are calculated. The energy dependence of the reaction probabilities shows oscillating structures for both reaction channels. At low temperature or collision energies, the H atom abstraction is favored due to tunnelling effect. In partially deuterated the breaking of the C–H bond is favored over that of the C–D bond in the entire energy range studied. In reaction at high energies, the HD product dominates simply due to statistical factor.
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