Positron-Impact Ionization of Atomic Hydrogen in a Bichromatic Laser Field in the Second Born Approximation

• 作者: 娄俊
• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 关键词: 第二玻恩近似 电子碰撞电离 氢原子 激光场 正电子散射 三重微分截面 连续状态 波函数
• 年，卷（期）: 2010,（10）
• 页码范围: 84-87
• 页数: 4页
• 分类号: O436.2 O562.4
• 语种: 英文

摘要

The positron impact-ionization of atomic hydrogen in the presence of a linearly polarized bichromatic field is investigated in the second Born approximation. The field is composed of a fundamental frequency and its second harmonic. The state of positron in the field is described by the Volkov wavefunction, and the continuum state of the ejected electron is described by the Coulomb-Volkov wavefunction. The dressed ground state of target is a first order time-dependent perturbative wavefunction. The triple differential cross sections and their dependencies on laser field parameters are discussed. Numerical results demonstrate that the second-order effect plays a crucial role in understanding the laser-assisted positron scattering process.