原子(離子)光電離過程的理論研究.pdf

1、西北師范大學碩士學位論文原子(離子)光電離過程的理論研究姓名：孫長平申請學位級別：碩士專業(yè)：原子與分子物理指導教師：周效信2008-06IIIABSTRACT Since the photoionizations of atoms and ions take place in a large variety of astrophysical systems, the upper atmosphere and different type

2、s of celestial body plasmas and laboratory plasmas.The theoretical caculations of photoionization cross sections are important for studying many physical processes.This thesis, in the LS coupling, the photoionization cro

3、ss sections of the atoms and ions are caculated theoretically using R-matrix method. The following is the main contents of my thesis: 1. The photoionization cross sections of ground state 2s22p3(4So) of atomic nitrogen a

4、re calculated for photon energies between 1 and 3 Ry. The calculated resonance energies of 2s2p3(5So)np4P(n=3-10) are compared with existing experimented measurements and theoretical calculations. A good agreement is obt

5、ained between our results and ones of MCHF calculations and recent experiment. 2. We have calculated the partial and total photoionization cross sections of the ground state 2s22p5 (2Po) of atomic fluorine for photon ene

6、rgies between the 1D and 1S thresholds of atomic fluorine and the energy positions of the autoionization resonance series 2s22p4(1S)ns 2S, 2s22p4(1S)md 2D as well as 2s2p6 2S excitation. A good agreement is obtained betw

7、een the length and velocity forms for the partial cross sections given. Our results are in good with measurements and theoretical calculations. 3. We have calculated the partial and total photoionization cross sections f

8、or L-shell Photonization of ions F3+ and Ne4+ of ground states 2s22p2 (3P) and excited state 2s22p2（1D 、 1S) 、 2s2p3 (5So) and the energy positions of many autoionization resonance series. Compared our results with the

9、recent experimental ones and the latest multiconfiguration Dirac-Fock calculations, our results are in good agreement with the recent experimental ones. Keywords: photoionization; autoionization resonances; R-matrix; N a