Photoionization and Spectroscoy of Atoms and Molecules (Physics)

原子和分子的光电离和光谱（物理学）

• 批准号: 8701193
• 负责人: C. Denise Caldwell
• 金额: $ 16.82万
• 依托单位: The University of Central Florida Board of Trustees
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-01 至 1990-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8701193&HistoricalAwards=false
• 关键词: Photoionization; Spectroscoy; Atoms; Molecules; Physics

For the investigation of electron-electron correlation in atoms, the complete understanding, both experimental and theoretical, of its influence in helium is indispensable. For the past two years the investigators have been engaged in an experimental and theoretical program to analyze this correlation. The process which is examined is the photoionization to produce the n=2 level of the He+ ion. Through a measurement of the alignment of the 2P3/2 state, the additional experiment necessary to determine the partial cross sections for production of all continuum state contributing to the ionization has been performed at two energies. This parameter will be measured throughout the energy region from the n=2 to the n=3 ionization limits, with special attention to the 3s3p resonance at 69.9 eV. In support of the experimental program a theoretical calculation of the alignment using hyperspherical coordinates will be carried out. A transformation of the alpha-coordinate allows solution of the angular equations using a series expansion. This simplifies the numerical procedures and allows calculation of more accurate channel functions and coupling parameters. The alignment and electron angular distribution parameter beta will be calculated, as well as the accuracy with which calculations using this technique can be made and the scattering phase shifts for the e- + H system.

为了研究电子-电子关联， 原子，完整的理解，无论是实验和 理论上，它对氦的影响是不可或缺的。 为 在过去的两年里，调查人员一直在从事一项 实验和理论程序来分析这种相关性。 所研究的过程是光电离产生 He+离子的n=2能级。 通过测量 2 P3/2态的排列，需要额外的实验 为了确定用于生产所有 对电离有贡献的连续态已经被执行 两种能量。 该参数将在整个 从n=2到n=3电离极限的能量区域， 特别注意在69.9eV处的3s 3 p共振。 为了支持实验计划， 使用超球坐标计算对准 将被执行。 α坐标的变换 允许使用级数解角方程 扩张. 这简化了数值程序，并允许 计算更精确的通道函数和耦合 参数 取向和电子角分布 将计算参数β，以及 使用这种技术可以进行哪些计算， 散射相移的e- + H系统。