Theoretical Studies On Photoionization Of MnⅠ And MnⅡ

Interaction of photon with atoms and ions is a fundamental process important in such areas as astrophysics, plasmas physics and laser physics and more. This dissertation concentrates on photoionizaiton of Mnl and Mnll including resonance structure in the framework of many-body perturbation theory(MBPT). More accurate results were obtained by using the new approach to calculate resonance structure and photoionization cross section.The Coupled Equation Method(CEM) has been improved to calculate 4s subshell of Mnl by adding 3d⁵((4)^X)4s((5)^X) channels, which were verified to play a key role to the magnitude of resonance structure due to the interaction between 4s → kp transition and 3p→3d excitation. Our calculation shows higher symmetry and a solo peak near 51.7eV, which is in better agreement with experimental data than Garvin's calculation.Except 3p → 3d giant resonance, there are obvious 3p → nd(n > 4) Rydberg resonances with width in the total cross section of Mnl. Garvin's calculation was too sharp to be accepted physically. To solve this problem, higher order diagrams were included after detailed mathematic preparation and physical interpretation. In order to see their effect and to avoid the "black box" working style of CEM, these diagrams were added to CEM one by one. Comparison is made with experiment and the results show that higher order diagrams decrease the diverged resonance structure effectively.It's so hard to study the photoionization of Mnll that it has two opensubshells. In this dissertation, the effective single-particle potential was chosen to descript total effect of many final-state interactions. Compared with CEM, the generalized resonance method was used to calculate resonance structure for it can account for many resonance transitions efficiently. Up to now, this is the first theoretical study by using MBPT. The calculation reproduced 3p→3dand 3p → 4s resonance well. Furthermore, five satellite lines were found rather than Dolmatov's RPAE calculation. 3p → 5s and 3p → nd(n > 4) Rydberg resonance were also found as the first time.