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Published January 15, 1973 | Published
Journal Article Open

Equations-of-motion method including renormalization and double-excitation mixing

Abstract

The equations‐of‐motion method is discussed as an approach to calculating excitation energies and transition moments directly. The proposed solution [T. Shibuya and V. McKoy, Phys. Rev. A 2, 2208 (1970)] of these equations is extended in two ways. First we include the proper renormalization of the equations with respect to the ground state particle‐hole densities. We then show how to include the effects of two‐particle‐hole components in excited states which are primarily single‐particle‐hole states. This is seen to be equivalent to a single‐particle‐hole theory with a normalized interaction. Applications to various diatomic and polyatomic molecules indicate that the theory can predict excitation energies and transition moments accurately and economically.

Additional Information

© 1973 The American Institute of Physics. Received 20 August 1971. Work supported in part by a grant from the National Science Foundation.

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August 19, 2023
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