文摘
The effect of the rotational excitations of CHD3(v1 = 1, |J,K鉄? in reaction with the Cl atom was investigated in a crossed-beam, product-imaging experiment over the collisional energy (Ec) range 1鈥? kcal mol鈥?. It was found that the initial J- and K-selections affect only the total reactivity, not the more detailed product-state and angular distributions鈥攁 surprising result that defies conventional wisdom. Although the higher reactivity with increasing J states could be understood as a result of a wider range of attack angles near the barrier, the observed K-propensity of 蟽|J0鉄?/sub> < 蟽|JJ鉄?/sub> for J = 1 at Ec < 2 kcal mol鈥?, opposite to that reported previously at higher Ec鈥檚, is perplexing and yet to be explained.