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William D. Laidig
Researcher at Procter & Gamble
Publications - 43
Citations - 1933
William D. Laidig is an academic researcher from Procter & Gamble. The author has contributed to research in topics: Coupled cluster & Singlet state. The author has an hindex of 19, co-authored 42 publications receiving 1886 citations. Previous affiliations of William D. Laidig include University of California, Berkeley & University of Florida.
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The description of N2 and F2 potential energy surfaces using multireference coupled cluster theory
TL;DR: In this article, the ground state potential energy surfaces (PES) for diatomic nitrogen and fluorine were examined using a version of the linearized multireference coupled cluster method (MR•LCCM).
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Analytic gradients from correlated wave functions via the two‐particle density matrix and the unitary group approach
Bernard R. Brooks,William D. Laidig,Paul Saxe,John D. Goddard,Yukio Yamaguchi,Henry F. Schaefer +5 more
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A multi-reference coupled-cluster method for molecular applications
TL;DR: In this paper, a new size-extensive, multi-reference coupled-cluster method that properly includes the important effects of semi-internal excitations is presented and a new model is presented to estimate the effect of semi internal excitations.
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Analytical gradients for the coupled-cluster method†
TL;DR: In this article, a non-diagrammatic formulation of the analytical first derivative of the coupled-cluster (CC) energy with respect to nuclear position is presented and some features of an efficient computational method to calculate this derivative are described.
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The Loop-Driven Graphical Unitary Group Approach: A Powerful Method for the Variational Description of Electron Correlation
TL;DR: The graphical unitary group approach (UGA) has been cast into an extraordinarily powerful form by restructuring the Hamiltonian in terms of loop types as discussed by the authors, which allows the adoption of the loop-driven formulation which illuminates vast numbers of previously unappreciated relationships between distinct Hamiltonian matrix elements.