CLOSE-COUPLING CALCULATION FOR THE 2-SIGMA+U STATE OF H2

被引:10
作者
GORCZYCA, T [1 ]
NORCROSS, DW [1 ]
机构
[1] UNIV COLORADO, BOULDER, CO 80309 USA
来源
PHYSICAL REVIEW A | 1990年 / 42卷 / 09期
关键词
D O I
10.1103/PhysRevA.42.5132
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We demonstrate the utility of the close-coupling approximation, usually applied to scattering problems, for calculations of molecular bound states. Our primary test case is the u+2 state of H2-. While limited to Hartree-Fock accuracy, our analysis of this resonant state within the bound region parallels closely the results from more precise quantum-chemical calculations. Specifically, the crossing between the neutral and negative-ion curves occurs at an internuclear separation of 3.025 a.u. in our calculation, in good agreement with a multireference configuration-interaction approach of previous authors. The shape and total energy of the anion curve, when corrected for by the correlation energy of the target at the crossing, is also in good agreement with earlier results. The method is then extended into the unbound or resonant-state region by studying the shape-resonance behavior of scattering eigenphase sums. © 1990 The American Physical Society.
引用
收藏
页码:5132 / 5138
页数:7
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