Performance of Ornstein-Uhlenbeck diffusion quantum Monte Carlo for first-row diatomic dissociation energies and dipole moments

被引:10
作者
Lu, SI [1 ]
机构
[1] FooYin Univ, Dept Appl Chem, Kaohsiung Hsien 831, Taiwan
关键词
D O I
10.1063/1.1558472
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, calculation of nine first-row diatomic dissociation energies (D-e) and six first-row heterodiatomic equilibrium dipole moments (mu(e)) highlights the strength of Ornstein-Uhlenbeck diffusion quantum Monte Carlo with the fixed-node approximation. By combining explicitly correlated wave functions based on spherical Gaussian-type orbitals and geminals obtained by an optimization of energy functional, it was possible to achieve satisfied agreement with experiment in most cases. Calculations on the molecules LiH, Li-2, BH, BF, HF, LiF, CO, N-2, and F-2 are presented. This work gives an accuracy that is comparable to or better than previous theoretical estimates. We also compare the performance of three different approximations in estimating dipole moments of molecules. (C) 2003 American Institute of Physics.
引用
收藏
页码:6152 / 6156
页数:5
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