在分子束-气装置上研究Sn+N2O反应的动态学

在分子束-气装置上测量了Sn+N_2O和Sn+O_2反应的发光光谱, 得到了压力为10~(-2)～10~(-4)乇时两个反应的发光光谱随反应压力的变化, 结果表明: Sn+N_2O反应生成的SnOa~(3∑)态主要是由其它电子态经碰撞而布居的。实验用化学发光方法测得了Sn+N_2O反应的总碰撞截面为0.32 nm, 说明发光态是由Sn(~3P_2)+N_2O反应直接产生的。

CHEMILUMINESCENT REACTION DYNAMICS OF Sn+N2O IN BEAM-GAS

The chemiluminescence reaction of tin with N_2O and O_2 have been investigated in a beam-gas apparatus under the pressure range of 10~(-4)—10~(-2) torr. The chemiluminescent spectra recorded for both reactions under single-collision conditions have been recognized as the emission of b~3Π(0) and b'3Π(1) state to the ground state of SnO produced in the reaction. For the reaction of Sn with N_2O, the emission from a~3∑-X~1∑ transition obviously becomes enhanced with in creasing of background gas pressure. The relative population of a~3∑ state on v=0 and v=1 as well as the emission intensity of a~3∑ and b~1Π(1) states to X~1∑ state of SnO have been measured also. The total cross section of collision is about 0.32 nm. In analyzing the experimental results, it is found that the production of electronically excited SnO molecule from the reaction of Sn with N_2O may proceed with the following mechanism:Sn(~3P_2)+N_2O(X~1∑)→SnOb~3Π(0), b′~3Π(1)]+N_2(X~1∑~+_g)andSn+N_2O(X~1∑~+)→SnO(i)+N_2O(X~1∑~+_g)in which i is a long-lived electronic state.