Hydrogen Plasma-based Electron And Ion Collision Processes

Based on the excitation cross sections in collisions of H(1s) atoms with He2+obtained by the classical trajectory Monte Carlo method, the state-selective cross sections of excitation processes for different n and m, where n and m are the principle and magnetic quantum number respectively, are studied with the strong longitudinal and transverse magnetic fields applied. Meanwhile the precise energy levels for atom H in the strong magnetic fields are obtained by non-perturbative quantum method. It is found that there is some strong separation of the state-selective cross sections among different magnetic quantum states. Such behaviors are related to the variation of the energy levels and the diamagnetic terms induced by the applied magnetic fields. The diamagnetic terms in transverse magnetic fields results in the rapid increasing of the cross sections for the state of negative m at25keV/u, which is further indicated by the trajectory in this case. In some cases the decreasing of the total excitation cross sections is found due to the rising of the energy levels caused by the magnetic fields. The orbital angular momentum along the direction of the magnetic field is not conserved absolutely, which is found in the trajectories and agrees with our analysis. The first order differential cross sections for ionization have been calculated for different field strength of both transverse and parallel magnetic fields. It was found that the results have been increased obviously with the fields applied. Instead of monotonous decline, a peak appears for the differential cross sections with the fields applied. According to the analysis of trajectories, it is found that the ionization mechanisms have become quite different. In this paper, it is also interpreted the influence the strength and direction of the applied field including the incident energy on the ionization mechanisms.The other work is hydrogen atom imbedded in Debye plasmas with an external magnetic field, the combined effect on bound-bound transitions is investigated herein. The electron eigenenergies and wave functions are determined by non-perturbative solving the Schrodinger equation. Both transition frequencies and oscillator strengths are presented for a wide range of plasma screening parameters and external magnetic field strengths. With increasing the plasma screening, the shielding effects on the Lyman series are manifested in the decrease of its intensity and the red-shift of its frequency. After adding an external magnetic field, atomic energy levels undergo even stronger perturbation, as well as the line shapes become polarized. The non-perturbative effect is significant for the quantum states (n>3). Comparisons are made to other theoretical calculations with good agreement. The wave length,transition probability and the dipole strength of hydrogen atom with various values of Debye screening parameters and strength of magnetic field. We also give some interprets about these results The results reported here should be useful for the interpretation of spectral properties of H-like ions in laboratory and astrophysical Debye plasmas.Based on the hydrogen atom imbedded in Debye plasmas with an external magnetic field, the collision processes of H(ls) atoms with He2+is be discussed. The result of total cross section is effected by the atom structure. The first order differential cross sections for ionization and the difference of ionization mechanisms be found also be found. The tendency of the first order differential cross sections for ionization is agree with the result of total cross section.But the first order differential cross sections for ionization has some differential.In this paper,we also give the interprets.