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Multiconfiguration self-consistent field and multireference configuration interaction methods and applications

机译:多配置自洽字段和多引用配置交互方法及应用

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Recent developments on gradient theory, calculation of molecular properties, nonadiabatic coupling between electronic states, and relativistic and spin-orbit effects, are discussed. Shepard et al. proposed the subspace projected approximate matrix (SPAM) method that employs a sequence of one or more approximations to the H matrix. Duch and Diercksen compared the formulas and concluded that the DuchDiercksen and Pople corrections clearly outperform the original Davidson correction and its renormalized variants. Tanaka and co-workers developed multireference coupled pair approximation (MRCPA) method that is size-consistent for noninteracting electron pairs and can be applied to excited states, but analytic gradient calculations are not available. Chan and Head-Gordon used a reverse CuthillMcKee reordering of the orbitals to make the one-electron integral matrix close to band-diagonal.
机译:讨论了梯度理论,分子性质的计算,电子态之间的非绝热耦合以及相对论和自旋轨道效应的最新进展。 Shepard等。提出了子空间投影近似矩阵(SPAM)方法,该方法采用对H矩阵的一个或多个近似序列。 Duch和Diercksen比较了这些公式并得出结论,DuchDiercksen和Pople校正明显优于原始的Davidson校正及其重新规格化的变体。 Tanaka和他的同事开发了多参考耦合对近似(MRCPA)方法,该方法对于非相互作用电子对具有尺寸一致性,可以应用于激发态,但是无法使用解析梯度计算。 Chan和Head-Gordon对轨道进行了反向CuthillMcKee重排,以使单电子积分矩阵接近能带对角线。

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