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Mulliken population analysis
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Mulliken population analysis : ウィキペディア英語版
Mulliken population analysis
Mulliken charges arise from the Mulliken population analysis〔I. G. Csizmadia, Theory and Practice of MO Calculations on Organic Molecules, Elsevier, Amsterdam, 1976.〕 and provide a means of estimating partial atomic charges from calculations carried out by the methods of computational chemistry, particularly those based on the linear combination of atomic orbitals molecular orbital method, and are routinely used as variables in linear regression (QSAR) procedures. The method was developed by Robert S. Mulliken, after whom the method is named. If the coefficients of the basis functions in the molecular orbital are Cμi for the μ'th basis function in the i'th molecular orbital, the density matrix terms are:
: \mathbf \sum_ \mathbf ^
*}
for a closed shell system where each molecular orbital is doubly occupied. The population matrix \mathbf then has terms
: \mathbf } \mathbf is the overlap matrix of the basis functions. The sum of all terms of \mathbf is the gross orbital product for orbital \mathbf - \mathbf } as the sum of \mathbf belonging to atom A. The charge, \mathbf } , and the gross atom population:
: \mathbf } - \mathbf {GAP_{A}}
== Mathematical problems ==


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