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Spin-polarization in HBr: Comparison between theory and experiment

机译：HBr中的自旋极化：理论与实验的比较

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Measurements of the electron spin polarization parameter A have been performed for HBr in the energy region between the two ionization thresholds, (II3/2)-I-2 and (II1/2)-I-2. Using the multichannel quantum defect theory and formulas derived for the spin parameters in intermediate coupling between Hund's cases (a) and (e), calculations for both the cross section and the A parameter have been performed. It is shown that the values of A for each Rydberg resonance change with n, following the change from Hund's case (a) to case (e). In the approximations used in this paper, no simple relation between the sign of A and the value of J(+), the rotational angular momentum of the ion core, was found. Values for the calculated angular asymmetry parameter beta and the spin polarization parameter xi are also presented. Since our calculations reproduced only part of the observed resonances, and since the measurements of the A parameter have been performed in relatively narrow energy regions, one could not perform an extensive comparison between theory and experiment. However, some of the peculiarities of the behavior of the A parameter observed experimentally have been qualitatively reproduced by our calculations. (C) 1998 American Institute of Physics. [References: 27]
机译：已经在两个电离阈值（II3 / 2）-I-2和（II1 / 2）-I-2之间的能量区域中对HBr进行了电子自旋极化参数A的测量。使用多通道量子缺陷理论和在洪德案例（a）和（e）之间的中间耦合中得出的自旋参数公式，已经进行了截面和A参数的计算。结果表明，随从洪德的情况（a）到情况（e）的变化，每个Rydberg共振的A值随n变化。在本文中使用的近似值中，未找到A的符号与J（+）值（离子核的旋转角动量）之间的简单关系。还提供了计算出的角度不对称参数beta和自旋极化参数xi的值。由于我们的计算仅重现了观察到的共振的一部分，并且由于A参数的测量是在相对狭窄的能量区域中进行的，因此无法在理论和实验之间进行广泛的比较。但是，通过实验计算，定性地再现了实验观察到的A参数行为的某些特殊性。 （C）1998美国物理研究所。 [参考：27]

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