中高能电子被O_2及CF_4分子散射的微分截面、弹性积分截面及动量转移截面

Absolute differential, elastic integral and moment transfer cross sections for electron scattering from O_2 and CF_4 at intermediate-and high-energies

利用可加性规则,使用Roothaan-Hartree-Fock波函数,采用由束缚原子概念修正过的复光学势,在300—1000eV内若干个能量点处计算了电子被O2及CF4分子散射的微分截面、弹性积分截面及动量转移截面,并将计算结果与实验结果及其他理论计算结果进行了比较.比较的结果表明,利用被束缚原子概念修正过的复光学势及可加性规则进行计算,所得微分散射截面的精度要比利用未修正的复光学势及可加性规则进行计算得到的结果准确得多;同时,计算得到的弹性积分截面及动量转移截面也比较接近实验值.因此,在复光学势中采用束缚原子概念可提高电子被分子散射的微分截面、弹性积分截面及动量转移截面的计算准确度.

A complex optical model potential modified by incorporating the concept of bonded atom, which takes into consideration the overlapping effect of electron clouds between two atoms in a molecule, is employed to calculate the absolute differential cross sections, the elastic integral cross sections, and the moment transfer cross sections for electron scattering from O-2 and CF4 in the energy range 300-1000 eV by using additivity rule model at Roothaan-Hartree-Fock level. The quantitative absolute differential cross section, elastic integral cross section, and moment transfer cross section results are compared with those obtained by experiments and other calculations wherever available, and good agreement is obtained. It is shown that the additivity rule model together with the complex optical model potential modified by incorporating the concept of bonded atom can give better results than the one unmodified by it. So, the introduction of the bonded-atom concept in complex optical model potential betters the accuracy of the absolute differential cross sections, the elastic integral cross sections, and the moment transfer cross sections.