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- W2018144788 abstract "A recently proposed orthonormality constrained orbital optimization technique is operationally modified further by coupling it to a gradient biased method, namely the steepest descent procedure of McWeeny. The hybrid technique developed in this way is shown to have better convergence properties in closed and unrestricted open-shell calculations. The technique can be adapted to MCSCF procedures as well. The important role played by orbital symmetries in the operation of the method is analysed. Similarities and differences of the present method with the orthogonal gradient method are pointed out. Possible avenues of circumventing convergence difficulty that one may encounter in pathological cases, particularly in ab initio calculations involving extended basis set, are suggested." @default.
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- W2018144788 date "1981-12-01" @default.
- W2018144788 modified "2023-10-04" @default.
- W2018144788 title "A hybrid technique of orthonormality constrained orbital optimization inSCF calculations" @default.
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- W2018144788 doi "https://doi.org/10.1002/qua.560200603" @default.
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