用振动密耦合方法研究低能电子与N2分子碰撞的振动激发微分散射截面

Studies on vibrational excitation differential cross sections of low-energy electron scattering from N_2 molecule by vibrational close-coupling method

采用振动密耦合方法,分别应用球高斯分布极化势和优于绝热极化势,及基于量子力学从头计算的静电、交换势,得到入射电子能量2.40eV时0→2和0→3的振动激发微分散射截面,与目前优秀的实验值比较,获得了满意的结果,并从理论上分析了整个计算过程中可能影响微分散射截面精度的主要物理因素.

The differential cross sections （DCS） of low-energy electron-N2 scattering are studied using vibrational close-coupling （VCC） method and vibrational scattering potentials which include the static, exchange and polarization contributions, where the polarization is obtained on the basis of “better than adiabatic dipole” （BTAD） and “distributed spherical Gaussian”（DSG） respectively. The converged （0→2, 0→3） DCS are obtained for the impact energy of 2.40 eV. Calculations using both polarization potentials agree with experimental results. The physical factors that possibly affect the accuracy of DCS values are also discussed.