B-spline expansion of scattering equations for ionization of atomic hydrogen by antiproton impact
B-spline expansion of scattering equations for ionization of atomic hydrogen by antiproton impact
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反质子撞击原子氢电离散射方程的 B 样条展开
DOI：
10.1103/physreva.64.062704
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发表时间：
2001
影响因子：
2.9
通讯作者：
A. Igarashi
中科院分区：
文献类型：
--
作者：
J. Azuma;N. Toshima;K. Hino;A. Igarashi
采用基于B样条展开的紧耦合方法研究了能量范围为0.1-500 keV的反质子碰撞氢原子的电离过程。叠加的分段B样条函数使我们能够更灵活地表达连续波函数比传统的伪状态表示，其中整体功能，如Sturmian用于扩展。该展开式还弥补了传统单中心展开式由于赝态范围有限而低估低能电离截面的缺陷。我们的电离截面与最近的双中心计算在所有的能量非常一致。电子的概率密度也在坐标和动量空间。
We study ionization processes of atomic hydrogen by antiproton impact in the energy range of 0.1-500 keV by the close-coupling method based on the B-spline expansion. Superposition of piecewise B-spline functions enables us to express the continuum wave functions more flexibly than the traditional pseudostate representation, in which overall functions such as the Sturmian are used for the expansion. The present expansion also remedies the defect of the traditional one-center expansion that the ionization cross section is underestimated at low energies owing to the finite range of the pseudostates. Our ionization cross sections agree excellently with recent two-center calculations at all the energies. The electron probability densities are also presented in both the coordinate and the momentum spaces.