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本文在束-气条件下研究了Sr(~1S),Sr(~3P)+Cl_2的化学发光反应。实验压力为10~(-5)～10~(-4)Torr,金属束炉温1000K左右。同时,观测和分析了Sr,Sr~*+Cl_2反应产物Sr(A,B)、SrCl_2~*的发光光谱。发现Cl_2压力(pcl_2)较低时,主要生成SrCl~*;而pcl_2增高时(>2×10~(-4)Torr),SrCl_2~*的发射光谱逐渐增强。实验结果表明,SrCl~*是单次碰撞的直接产物,其发光强度(I_(SrCl)~*)与pcl_2、Sr的原子密度均为直线关系,而I_(SrCl_2)~*与pCl_2成二次关系,表明SrCl_2~*是SrCl~*和Cl_2碰撞的产物,与BaCl_2~*的生成机理相同。由实验结果计算而得到的亚稳态Sr~*原子及基态Sr原子在Cl_2中的总消除截面分别为97±5(?)~2及58±5(?)~2。由此估计由亚稳态Sr~*及基态Sr与Cl_2反应生成SrCl(A)的相对光子产率为φ~*/φ~0=115。
In this paper, the chemiluminescence reaction of Sr (~ 1S), Sr (~ 3P) + Cl_2 was studied under beam-gas conditions. The experimental pressure is 10 ~ (-5) ~ 10 ~ (-4) Torr, and the temperature of the metal beam is about 1000K. At the same time, the luminescence spectra of Sr (A, B) and SrCl_2 ~ * were observed and analyzed. The results show that SrCl ~ * is mainly formed when the pressure of Cl_2 is low, and the emission spectrum of SrCl_2 ~ * increases when the temperature of pcl_2 is increased (> 2 × 10 ~ (-4) Torr). The experimental results show that SrCl ~ * is a direct product of single collision and the luminescence intensity (I_ (SrCl) ~ *) is linear with the atomic density of pcl_2 and Sr, while I_ (SrCl_2) ~ * The results show that SrCl_2 ~ * is the product of collision between SrCl ~ * and Cl_2, which is the same as that of BaCl_2 ~ *. The total elimination cross sections of metastable Sr ~ * atoms and ground state Sr atoms in Cl_2 obtained from the experimental results are 97 ± 5 (?) ~ 2 and 58 ± 5 (~) ~ 2, respectively. It is estimated that the relative photon yield from the metastable Sr ~ * and the ground state Sr to Cl_2 to SrCl (A) is φ ~ * / φ ~ 0 = 115.