Photoionization and Spectroscoy of Atoms and Molecules (Physics)

为了研究原子中的电子-电子相关关系，从实验和理论两方面全面了解它对氦的影响是必不可少的。在过去的两年里，研究人员一直在进行一项实验和理论计划来分析这种相关性。所研究的过程是产生n=2能级的He+离子的光电离。通过测量2P3/2态的排列，在两个能量下进行了必要的附加实验，以确定导致电离的所有连续态产生的部分横截面。该参数将测量从n=2到n=3电离极限的整个能量区域，特别注意69.9 eV下的3s3p共振。为了支持实验方案，将进行超球坐标对准的理论计算。坐标的变换允许用级数展开来解角方程。这简化了数值过程，并允许计算更准确的通道函数和耦合参数。计算了e- + H体系的准直和电子角分布参数β，以及利用该技术进行计算的精度和散射相移。

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.