RUI: Photoionization of Excited States of Atoms and Ions

RUI：原子和离子激发态的光电离

• 批准号: 9105211
• 负责人: Jayanti Lahiri
• 金额: $ 1.59万
• 依托单位: Southern College of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-15 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9105211&HistoricalAwards=false
• 关键词: RUI; Photoionization; Excited; States; Atoms

Photoionization cross sections and photoelectric angular distribution asymmetry parameters will be calculated for excited states of atoms and ions over a broad range of hv, n, 1, nuclear charge and stage of ionization, employing Hartree Slater wave functions. Oscillator strengths and discrete to discrete transitions will also be studied. The investigation will focus on understanding the systematics of variation of the Cross sections and angular distributions over the periodic system. Hartree Fock calculations will be done for any of these transactions, as may be warranted, for greater accuracy. Isoelectronic sequences will be investigated to study the gradual change in behavior towards hydrogenic. Changes in photoionization pattern over isonuclear and iso-ionic sequences will also be looked into. To fully understand the interaction of photons with matter, radiative recombination cross sections. Consequently every system investigated for photoionization will also be investigated for radiative recombination. The method at present employed is a little restrictive in the sense that a study of the very highly excited states becomes impossible due to a numerical problem of convergence, To overcome this computational limitation, an attempt will be made at formulating a new methodology based on the quantum defect theory.

将采用 Hartree Slater 波函数计算原子和离子在较宽范围的 hv、n、1、核电荷和电离阶段的激发态的光电离截面和光电角分布不对称参数。 还将研究振荡器强度和离散到离散的转变。 研究的重点是了解周期系统中横截面变化和角度分布的系统性。 为了获得更高的准确性，Hartree Fock 将对所有这些交易进行计算（如有保证）。 将研究等电子序列以研究氢行为的逐渐变化。 还将研究同核和等离子序列上光电离模式的变化。 充分了解光子与物质的相互作用，辐射复合截面。 因此，每个研究光电离的系统也将进行辐射复合研究。 目前采用的方法有一点限制，因为由于收敛的数值问题，对非常高激发态的研究变得不可能。为了克服这种计算限制，将尝试制定一种基于量子缺陷理论的新方法。