【摘要】 在分子束-气装置上测量了Sn+N₂O和Sn+O₂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+N₂O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+N₂O反应的总碰撞截面为32A²,说明发光态是由Sn（³P₂）+N₂O反应直接产生的。更多还原

【Abstract】 The chemiluminescence reaction of tin with N₂O and O₂ 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 b³Π（0） and b’3/-/（1） state to the ground state of SnO produced in the reaction. For the reaction of Sn with N₂O, the emission from a³∑-X¹∑ transition obviously becomes enhanced with in creasing of background gas pressure. The relative population of a³∑ state on v=0 and v=1 as well as the emission intensity of a³∑ and b¹Π（1） states to X¹∑ state of SnO have been measured also. The total cross section of collision is about 32 ². In analyzing the experimental results, it is found that the production of ele ctronically excited SnO molecule from the reaction of Sn with N₂O may proceed with the following mechanism: Sn（³P₂）+N₂O（X¹∑⁺）→SnO[b³Π（0）, b’3Π（1）]+N₂（X¹∑_g⁺） and Sn+N₂O（X¹E⁺）→SnO（i）+N₂O（X¹∑_g⁺） in which i is a long-lived electronic state.更多还原