Study On Triple Differential Cross Section Of Helium Collision Single Ionization In A Laser Field Of Asymmetric Geometry

Electron-Atom collision ionization and scattering has got much concern in recent years. As one of the major methods about distribution of electrons in the nucleus, brought us new perspectives on research by introducing the different intensities of laser field in (e,2e) reaction.Fast electron impact ionization of helium atom in weak laser field is studied, using first-order Born approximation method to simplified calculation of the triple differential cross sections. And a method of hydrogen-like atom is chosen to describe the motion of electrons in the helium. Select a laser field which is low frequency electromagnetic field and in the form of pulse wave packet for transmission, we should notice the intensity of laser field is much smaller than the electric field strength caused by Coulomb force.Fast electron impact single ionization of helium atom under coplanar and non-coplanar asymmetric geometry conditions has investigated, when we take control variate method to know the influence of different parameters respectively. The incident electron energy is fixed as lkeV, emitted electron energy is chosen in the range of 5-18eV. Next we change the direction and intensity of the laser field to get further about varied laser field condition impact triple differential cross section.Analysis the triple differential cross section of field-free and a laser field during helium collision single ionization by fast electron, laser field has elevated and enhanced Binary peaks much more than Recoil peaks.We selected three types of laser field that parallel to the direction of the momentum transfer and incident electron, perpendicular to the scattering plane, all of them don’t affect the symmetry of triple-differential cross section, but some axis angle deflection occurs, as well as the peaks of Binary and Recoil produced a certain degree of change, but near degree 90° and 270 basically.