项目名称: 原子光电离过程的相对论理论研究
项目编号: No.11264033
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 刘晓斌
作者单位: 天水师范学院
项目金额: 40万元
中文摘要: 作为原子物理最基本的过程之一,原子的光电离是天体物理、等离子体物理和环境科学等领域中重要而且普遍存在的物理过程。天文观察资料表明,宇宙物质中99%以上均处于等离子体状态,而原子光电离方面的知识对等离子体的模型构建必不可少,其截面等相关参数对确定等离子体的不透明度及诊断非常重要。由于光电离显示了原子中电子关联的重要作用,其截面对电子波函数等非常敏感,通过原子光电离过程的研究不仅可以检验极端条件下相关理论的正确性,也是研究原子结构的重要方法。 本项目拟在全相对论多组态Dirac-Fock 方法和相应的研究原子结构和性质的程序包 GRASP以及新近发展的Relphoto08程序基础上,对原子光电离过程进行深入细致的研究,考察原子光电离过程电子关联及相对论效应等的影响,并期望我们的研究对相关领域的实际应用和实验研究提供必要的理论支持。
中文关键词: 多组态Dirac-Fock理论;光电离截面;光电子谱;电子关联;弛豫效应
英文摘要: As one of the most fundamental processes in atomic (ionic) physics, atomic photoionization is very important and ubiquitous physical process in certain regions such as astrophysics, plasma physics, environmental science and so on. It has been estimated that more than 99% of visible matter in the universe exists in plasma form and much of the information about the universe is carried by photons, then the ionic photoionization is indispensable in modeling of plasma matter, and the photoionization cross sections are needed for the determination of plasma opacities and plasma diagnostics. Since atomic photoionization shows the importance of electron correlation, and the cross sections are very sensitive to related electronic wave function, the study of atomic photoionization process can not only test the validity of related theory under extreme conditions, but also be an important theoretical method to study atomic structure. Based on the relativistic multi-configuration Dirac-Fock (MCDF) method and the corresponding program package GRASP of atomic structure and properties, the present project will study atomic photoionization process, investigate the influence of electron correlation and relativistic effects on atomic photoionization process systematically, and finally we hope that our theoretical results can provi
英文关键词: MCDF method;photoionization cross section;photoelectron spectra;electron correlation;relaxation effect