Study For The Hydrogen Atom Ionized By Electrons Of Laser Fields

Modern physics attention collision, collision divided into three categories, elastic collisions, inelastic collisions, reaction. This thesis is (e,2e) reaction assisted laser field problem, select a hydrogen atom (e,2e) reaction of target particles, which is to study the laser field assisted electron impact ionization reaction of hydrogen atoms. With or without the aid of laser field contrast triple differential scattering cross section changes.In dealing with the problem, we apply the test to meet the conditions of the Born approximation, with a Born approximation calculation method of analysis, then apply the density matrix theory as pure state and mixed state was classified to analyze the impact ionization process in the form of the wave functions to calculate values for transition matrix elements and the triple differential cross section of TDCS.Ionization reaction produces two peaks, called binary peak and peak recoil. During the reaction, the change is more complex recoil peak, we do not compare, so the impact of major paper compares and analyzes the field at the time whether the laser parameters and laser field, scattering angle and other changes in the value of binary peak generated in triple differential scattering manipulation one of the variables change, the other the same amount of control, and then change the variables, making the image of the triple differential cross section, analysis and comparison of changes in binary peak, found in the binary peak when the laser field have a certain upgrade. Geometry were studied coplanar asymmetric geometry and non-coplanar symmetric two geometrical conditions, the laser field direction parallel to the laser field were studied scattering the momentum generated during the difference that momentum transfer direction of the laser field is parallel to the electronic incident direction, and the laser field and the scattering cross section perpendicular to the three cases.Experiments selected laser field is weak field, when the laser field is weak enough to be regarded as a hydrogen atom is not affected at this time, in the pure state; when the laser field although the field is weak but reaches a certain intensity, in the laser field in a mixed state. Then discuss scattering pure state and mixed state of two different states.