,Positron total cross sections for collisions with O2, H2O and CH4 in energy range from 30 to 3000eV

• 作 者: Shi De-Heng Liu Yu-Fang Sun Jin-Feng Zhu Zun-Lue Yang Xiang-Dong
• 机 构: College of Physics & Electronic Engineering, Xinyang Normal University, Xinyang 464000, China“,”Depa
• 出 处: 中国物理（英文版）
• 发表日期: 2005年5期
• 关键词: positron scattering TCSs additivity rule atomic and molecular collision

Total (elastic plus inelastic) cross sections (TCSs) for the scattering of positrons by molecules O2, H2O and CH4 in the energy range from 30 to 3000eV are calculated using the additivity rule model at Hartree-Fock level. A complex optical model potential modified by incorporating the concept of bonded atom which takes into considerationthe overlapping effect of electron clouds between two atoms in a molecule is firstly employed for the TCS calculation of positron-molecule scattering. TCSs are quantitatively compared with those obtained in experiments and other theorieswherever available, and good agreement is obtained in the energy range from 30 to 3000eV. It is shown that the additivity rule model together with the modified complex optical model potential is completely suitable for the TCS calculations of the positron-molecule scattering.