Nascent distributions of ZnH and OH produced in the reactions of excited zinc and water

研究了Zn（4^1P_1）与氢化物分子如水和烷烃的反应。的新生的旋转和振动分布的ZnH以及OH的测定。从这些分布中，可以获得有关反应中间状态的信息。在水的情况下，确定了两种产物ZnH和OH的初生态分布。旋转分布都是玻尔兹曼型的。然而，旋转温度是显着不同的; 12000 K的ZnH和900 K的OH。ZnH也振动激发，峰值在upsiron^<$''>=1。相反，没有观察到OH振动的激发。用非线性几何中的Zn-H-OH中间体解释了这种非统计能量分配，并研究了Zn（4^1P_1）与烷烃的反应.的ZnH的新生的旋转和振动态分布进行了比较与统计模型预测。C（CH_3）_4的分布与统计分布相似，而简单烷烃的分布略高于统计分布。这些结果表明，反应通过相对长寿命的插入复合物进行。Zn（4^1P_1）与H_2（D_2）反应生成的ZnH和ZnD的初生态振动态分布比统计值冷得多。这些结果与对其它激发态金属-H_2体系提出的插入攻击模型一致。用于生产ZnH的量子产率被测量为低。三体解离过程一定比ZnH的产生更占主导地位。

The reactions of Zn (4^1P_1) with hydride molecules such as water and alkanes were investigated. The nascent rotational and vibrational distributions of ZnH as well as OH were determined. From these disributions, it is possible to obtained information on the intermediate states of the reactions.In the case of water, the nascent state distributions of both products, ZnH and OH,were determined. The rotational distributions were both Boltzmann-like. However, the rotational temperatures were significatly different ; 12000K for ZnH and 900K for OH.ZnH was also vibrationally excited, peaking at upsiron^<''>=1. In contrast, no excitation in the OH vibration was observed. Such a non-statistical energy partitioning is explained by considering a short-lived Zn-H-OH intermediate in a non-linear geometry.The reactions of Zn (4^1P_1) with alkanes were also studied. The nascent rotational and vibrational state distributions of ZnH were compared with those predicted by statistical models. The distributions for C (CH_3) _4 resembled to the statistical ones, while those for simple alkanes were a little hotter than the statistical ones. These results suggest that the reaction proceeds via a relatively long-lived insertive complex. There was no great difference in the production yields of ZnH.The nascent vibrational state distributions of ZnH and ZnD produced in the reactions of Zn (4^1P_1) with H_2 (D_2) were much cooler than the statistical ones. These results are consistent with the insertive attack model proposed for other excited metal-H_2 systems. The quantum yield for the production of ZnH was measured to be low. Three-body dissociation processes must be more dominant than the production of ZnH.