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对多组态微扰理论的一些改进

Some modifications in multiconfiguration perturbation theory
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摘要 在GVB MP2的原型理论中 ,GVB MP2不能正确退化回相应的单参考态微扰 (SR MP2 )极限。通过在 0 中恰当引入有限数目的单双激发之间的耦合项 ,使在趋于极限情况下 ,保证了GVB MP2具有正确的收敛行为 ,改正了原有的理论框架中存在的缺陷。改进后的GVB MP2方法在单点能量的数值计算中的修正很小。 The original GVB-MP2 cannot achieve the proper Moller-Plesset PT limit. A modified GVB-MP2 scheme is suggested, in which a limited number of coupling terms between single and double excitations are added into _0. By this way, GVB-MP2 retrieves the correct SR-MP2 limit.
出处 《原子与分子物理学报》 CAS CSCD 北大核心 2003年第4期501-506,共6页 Journal of Atomic and Molecular Physics
基金 国家自然科学基金 (批准号 :2 0 173 0 3 7)资助课题
关键词 多组态微扰理论 GVB-MP2 收敛极限 MCPT GVB-MP2 Converging limit
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