High-Order Above-Threshold Ionization of H+ in Intense Laser Field

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（3）
• 页码范围: 103-106
• 页数: 4页
• 语种: 英文

摘要

The nonperturbative quantum electrodynamics method proposed by Fu et al.[Phys.Rev.A 75 (2007) 063419]is employed to study the high-order above-threshold ionization (ATI) of a diatomic molecule. Based on this frequency-domain theory,the high-order ATI process can be regarded as ATI followed by laser-assisted collision,where the total transition amplitude is the coherent summation of the contributions from each ATI channel.The angular-resolved ATI spectrum,which agrees with the results by Becket et al.based on the time-domain method,is obtained by this frequency domain theory.Furthermore,it is demonstrated that the interference characteristics representing the molecular structure in the ATI spectrum originates from the recollision of the electron with two-centre ion in each ATI channel.