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- W1994470108 abstract "Performing quantum chemical integral evaluation directly, without recursion and without direct coupling of angular momenta according to the rotation group is analyzed. The rotation group limits the structure of these closed-form expressions. The result of all cross differentiation is a rotational invariant. Closed-form expressions are obtained for the general three- and four-center Gaussian integral. The solid harmonic addition formula can be used to express these integrals as sums of products of an exponent-independent (angular) factor and a molecular-orientation-independent (exponential) factor in a variety of ways. The results are products of two such factors summed over the set of distinct, relevant polynomials of the exponents. The coefficients of these polynomials, angular factors, are complicated but common to all n-center matrix elements and independent of any type of contraction. Derivatives must be obtained using the product rule. An implementation in the Solid Spherical Harmonic Gaussian (SSHG) computer code is outlined and preliminary comparison is made. © 2001 John Wiley & Sons, Inc. Int J Quant Chem 81: 373–383, 2001" @default.
- W1994470108 created "2016-06-24" @default.
- W1994470108 creator A5071363061 @default.
- W1994470108 date "2001-01-01" @default.
- W1994470108 modified "2023-09-27" @default.
- W1994470108 title "Direct quantum chemical integral evaluation" @default.
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- W1994470108 doi "https://doi.org/10.1002/1097-461x(2001)81:6<373::aid-qua1007>3.0.co;2-3" @default.
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