arXiv physics/99060081999-06-09physics.atom-ph

氢原子从阈附近到高能的电子碰撞电离

Electron-impact ionization of atomic hydrogen from near threshold to high energies

Igor Bray

DOI：: 10.1071/PH000355

摘要：

应用会聚密耦合（CCC）方法研究了入射能量为15.6，17.6，20，25，27.2，30，54.4，150和250 eV的氢原子基态的电子碰撞电离。给出了从全微分到全微分的截面。根据Stelbovics的分析[提交给Phys. Rev. Lett.（physics/9905020）]中，使用总自旋相关电离振幅的单独相干组合来计算等能量共享截面，发现其仅比Bray和Fursa [1996 Phys.Rev.A { \bf 54}，2991]建议的非相干组合大两倍。因此，CCC理论特别适合于等能量共享运动学区域，并且能够完全从头计算获得收敛的绝对散射振幅。这与Bray [1997 Phys. Rev. Lett. { \bf 78}，4721]，并且指示在等能量共享时CCC幅度收敛到步长的一半。在某些情况下，与实验的比较是令人满意的，在其他情况下，发现了实质性的差异。这些差异通常是不可预测的，并且确定了实验数据中的一些内部不一致。因此，要求新的（e，2 e）测量。

英文摘要：

Application of the convergent close-coupling (CCC) method to electron-impact ionization of the ground state of atomic hydrogen is considered at incident energies of 15.6, 17.6, 20, 25, 27.2, 30, 54.4, 150 and 250 eV. Total through to fully differential cross sections are presented. Following the analysis of Stelbovics [submitted to Phys. Rev. Lett. (physics/9905020)] the equal-energy sharing cross sections are calculated using a solely coherent combination of total-spin-dependent ionization amplitudes, which are found to be simply a factor of two greater than the incoherent combination suggested by Bray and Fursa [1996 Phys. Rev. A {\bf 54}, 2991]. As a consequence, the CCC theory is particularly suited to the equal-energy-sharing kinematical region, and is able to obtain convergent absolute scattering amplitudes, fully ab initio. This is consistent with the step-function hypothesis of Bray [1997 Phys. Rev. Lett. {\bf 78}, 4721], and indicates that at equal-energy-sharing the CCC amplitudes converge to half the step size. Comparison with experiment is satisfactory in some cases and substantial discrepancies are identified in others. The discrepancies are generally unpredictable and some internal inconsistencies in the experimental data are identified. Accordingly, new (e,2e) measurements are requested.

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