氮分子a″~1Σ_g^+(v'=0)和a″~1Σ_g^+(v'=1)+b^1Π_u(v'=0)广义振子强度的高能电子散射研究  

Generalized oscillator strengths of the a″~1Σ_g^+( v' = 0) and a″~1Σ_g^+( v' = 1) +b^1Π_u( v' = 0) of nitrogen studied by high-energy electron scattering

作　　者：冉崇阳 徐龙泉 刘亚伟[1] 朱林繁[1] 

机构地区：[1]中国科学技术大学近代物理系合肥微尺度物质科学国家实验室,合肥230026

出　　处：《原子与分子物理学报》2018年第1期79-83,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(U1332204;11274291;11504361)

摘　　要：利用快电子能量损失谱仪结合相对流量技术,在入射电子能量1500 eV和能量分辨70 meV的条件下,测量了氮分子a″~1Σ_g^+(v'=0)和a″~1Σ_g^+(v'=1)+b^1Π_u(v'=0)激发态的广义振子强度.通过与已有的电子散射结果以及X射线散射结果对比发现,对于a″~1Σ_g^+(v'=0)和a″~1Σ_g^+(v'=1)+b^1Π_u(v'=0),我们的结果与X射线散射结果在大动量转移出现差异,这表明对a″~1Σ_g^+(v'=0)和a″~1Σ_g^+(v'=1),即使入射电子能量1500 eV也没有达到一阶玻恩近似条件.在动量转移平方小于2 a.u.时,a″~1Σ_g^+(v'=1)+b^1Π_u(v'=0)与X射线散射结果的符合表明,对b^1Π_u(v'=0),1500 eV入射电子能量已经达到一阶玻恩近似条件.The generalized oscillator strengths of a′′1Σ＋g（v＇ =0）and a′′1Σ＋g（v＇ =1）＋b1Πu（v＇=0） of molecular nitrogen were measured at a high incident electron energy of 1500 eV and a high energy resolution of 70 meV with the aid of the relative flow technique. The present results are apparently different from the X - ray scattering ones in the large momentum transfer region, which indicates that for a′′1Σ＋g（v＇ =0） the first - order Born approximation is not satisfied at the incident electron energy E0 = 1500 eV in the large momentum transfer region. The ,tl 1） ＋ b^lI （v＇ 0） in K2 〈 2 agreement of the present results with the X - ray scattering ones for a″1Σ＋g（v＇=1）＋b1Πu（v＇=0） a.u. indicates that the first -order Born approximation is satisfied at the incident electron energy a″1Σ＋g（v＇=1）＋b1Πu（v＇=0）.

关 键 词：广义振子强度 氮分子 气体相对流量技术 电子碰撞 

分 类 号：O65[理学—分析化学]