Electron-Helium Scattering in Free-Free Transitions in a Bichromatic Laser Field  

作　　者：孙金锋 梁明超 朱遵略 

机构地区：[1]College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007 [2]Department of Physics, Luoyang Normal College, Luoyang 471022

出　　处：《Chinese Physics Letters》2007年第9期2572-2574,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10574039, and the Science Foundation for Young Scientists of Henval Normal University under Grant No 2005004.

摘　　要：Theoretical calculation of the differential cross section （DCS） for elastic electron-helium scattering in the presence of a bichromatic CO2 laser field is carried out in the first Born approximation with a simple screening electric potential. The two components of the laser field have the frequencies w and 2w, which are out of phase by an arbitrary scale φ. The variations of the differential cross section as a function of the phase angle φ in the domain 0°≤ φ ≤360° are presented. We discuss the influence of the number of photons exchanged on the phase-dependee effect. Moreover, for different scattering angles and incident electron energies, the DCS has outstanding ditferences. These illustrate that the two parameters have important effects on the differential cross section and the screening electric potential is effective.Theoretical calculation of the differential cross section （DCS） for elastic electron-helium scattering in the presence of a bichromatic CO2 laser field is carried out in the first Born approximation with a simple screening electric potential. The two components of the laser field have the frequencies w and 2w, which are out of phase by an arbitrary scale φ. The variations of the differential cross section as a function of the phase angle φ in the domain 0°≤ φ ≤360° are presented. We discuss the influence of the number of photons exchanged on the phase-dependee effect. Moreover, for different scattering angles and incident electron energies, the DCS has outstanding ditferences. These illustrate that the two parameters have important effects on the differential cross section and the screening electric potential is effective.

关 键 词：COHERENT PHASE-CONTROL CO2-LASER FIELD ATOM DEPENDENCE 

分 类 号：O43[机械工程—光学工程]