TY - JOUR
T1 - Floating functions satisfying the hellmann—feynman theorem
T2 - Single floating scheme
AU - Hirao, K.
AU - Mogi, Koichi
PY - 1992/1/1
Y1 - 1992/1/1
N2 - The electrostatic calculation for molecules using approximated variational wave functions leads to well known difficulties connected with the application of the Hellmann‐Feynman (HF) theorem. This is due to the basis set inadequacies in the underlying calculations. This defect can easily be remedied by floating functions, whose centers are optimized in space. We can keep almost everything of the traditional wave function with a nuclear‐fixed basis set, but we apply single floating to ensure the HF theorem. Then, one can obtain a wave function obeying the HF theorem. This provides a great conceptual simplification and may lead to practical advantages. The single floating scheme, which retains one expansion center per nucleus, is successfully applied to a series of small molecules using SCF and CASSCF wave functions with sufficiently polarized basis sets.
AB - The electrostatic calculation for molecules using approximated variational wave functions leads to well known difficulties connected with the application of the Hellmann‐Feynman (HF) theorem. This is due to the basis set inadequacies in the underlying calculations. This defect can easily be remedied by floating functions, whose centers are optimized in space. We can keep almost everything of the traditional wave function with a nuclear‐fixed basis set, but we apply single floating to ensure the HF theorem. Then, one can obtain a wave function obeying the HF theorem. This provides a great conceptual simplification and may lead to practical advantages. The single floating scheme, which retains one expansion center per nucleus, is successfully applied to a series of small molecules using SCF and CASSCF wave functions with sufficiently polarized basis sets.
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U2 - 10.1002/jcc.540130408
DO - 10.1002/jcc.540130408
M3 - Article
AN - SCOPUS:84986435692
VL - 13
SP - 457
EP - 467
JO - Journal of Computational Chemistry
JF - Journal of Computational Chemistry
SN - 0192-8651
IS - 4
ER -