Premium
A possible solution to the rotational invariance and silicon parameter problem in the MNDO approximation
Author(s) -
Deák Peter,
Snyder Lawrence C.
Publication year - 1987
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560320754
Subject(s) - mndo , atomic orbital , rotational invariance , center (category theory) , invariant (physics) , electron , physics , quantum mechanics , atomic physics , chemistry , computational chemistry , molecule , crystallography
In the original formulation of the MNDO method, the approximation of two‐center two‐electron integrals over p orbitals is not rotationally invariant, and the coulombtype integrals do not match their one‐center counterparts. In recent computer codes the rotational invariance has been restored by dropping the original approximation for two‐center exchange integrals over π orbitals, which at the same time disconnected these too from the one‐center values. It is shown in this paper that the rotational invariance problem can be overcome in the framework of the original approximation. It is also demonstrated that the mismatch between the one‐ and two‐center two‐electron integrals may be the reason for the too short Si‐Si bond lengths predicted by MNDO .