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- W2085452703 abstract "This paper considers three functions of several variables, W(r,x), λ(r), and E(r), related by E(r)=W[r,λ(r)] and the condition that W(r,x) be stationary with respect to variations of x when x=λ. Formulas are presented which relate coefficients in the Taylor series expansions of these three functions. We call λ the response function. Partial derivatives of the response function are obtained by solution of a recursive system of linear equations. Solution through order n yields derivatives of E through order 2n+1. This analysis extends Pulay’s demonstration of the applicability of Wigner’s 2n+1 rule to partial derivatives in coupled perturbation theory. A four-term second derivative formula is shown to be numerically more stable than the usual two-term formula. We refute previous claims in the literature that energy derivatives are stationary properties of the wave function." @default.
- W2085452703 created "2016-06-24" @default.
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- W2085452703 date "1986-05-15" @default.
- W2085452703 modified "2023-09-28" @default.
- W2085452703 title "Analytic computation of energy derivatives. Relationships among partial derivatives of a variationally determined function" @default.
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- W2085452703 doi "https://doi.org/10.1063/1.449924" @default.
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