中、高能电子被SO_2分子散射的微分截面、动量转移截面及弹性积分截面

Absolute differential,elastic integral and moment transfer cross sections for electron scattering by SO_2 at intermediate and high energies

在考虑分子内成键原子间的电子云重叠效应的基础上,提出了一种能够准确计算“中、高能电子-分子”散射的微分截面、动量转移截面及弹性积分截面的修正势方法.利用可加性规则、使用Hartree-Fock波函数并采用被这一方法修正过的复光学势,在100—1000eV内对电子被SO2分子散射的微分截面、动量转移截面及弹性积分截面进行了计算,并将计算结果与实验及其他理论结果进行比较.结果表明,利用这一修正过的复光学势及可加性规则获得的微分截面比利用未修正的复光学势及可加性规则得到的结果准确得多,计算得到的动量转移截面及弹性积分截面在入射电子能量不低于200eV时也都比较接近实验值.

Taking into consideration the overlapping effect of electron clouds between two bonded atoms in a molecule, a modificed potential method is presented which can be used to accurately calculate various cross sections for electron scattering by molecules at intermediate and high energies. The modified complex optical potential is directly employed to calculate the absolute differential, elastic integral and moment transfer cross sections for electron scattering by SO2 in the energy range 100-1000 eV by using the additivity rule at Hartree-Fork level. The quantitative results are compared with those obtained by measurement and other theories wherever available. It is shown that the additivity rule model together with the modified complex optical potential can give the encouraging results, which are much closer to the measurements than the unmodified ones.