1 500 eV入射下氦原子的电子碰撞双重微分散射截面测量

本工作使用高分辨快电子能量损失谱仪,在入射电子能量1 500 eV、能量分辨200 meV和散射角度0.5°～ 4.0°的实验条件下,测量了氦原子在电离连续区24.5～28.5 eV的双重微分散射截面.通过与理论及其它入射能量实验结果的比较,认为在入射电子能量为1 500 eV 时一阶Born近似成立.     

Superexcited states of carbon monoxide studied by fast-electron impact

Absolute optical oscillator strength density and double differential cross section spectra of CO below 120 eV are determined by fast electron impact. Some peaks above the first ionization threshold stand out as the momentum transfer square K2 increases. The doubly excited Rydberg states converging to C 2∑^＋, D ^2∏, and F ^2∏ states of CO^＋, respectively, are confirmed in our spectra. Another peak at around 32eV is assigned to the transition of （3σ）^-1（2π）^1^1∏←X^1∑^＋.