Some aspects of the time-dependent coupled-cluster approach to dynamic response functions. Dalgaard, E. & Monkhorst, H. J. *Physical Review A*, 28(3):1217–1222, 1983. doi abstract bibtex An approximation scheme for dynamic response functions within the coupled cluster or exp(T) method of Coester and K̈mmel is described in this paper. Particular attention is given to the relationship between the "vacuum amplitude" 0|U(t,-)|0 for the time development of an exact eigenstate of a many-electron Hamiltonian in the presence of an adiabatically switched-on perturbaction, and the amplitude 0|U(t,-)|0 for the time evolution into an independent-particle reference state |0, which is not orthogonal to |0. The latter amplitude plays a prominent role in the time-dependent coupled-cluster calculation of response functions. \textcopyright 1983 The American Physical Society.

@article{Dalgaard1983,
abstract = {An approximation scheme for dynamic response functions within the coupled cluster or exp(T) method of Coester and K̈mmel is described in this paper. Particular attention is given to the relationship between the "vacuum amplitude" 0|U(t,-)|0 for the time development of an exact eigenstate of a many-electron Hamiltonian in the presence of an adiabatically switched-on perturbaction, and the amplitude 0|U(t,-)|0 for the time evolution into an independent-particle reference state |0, which is not orthogonal to |0. The latter amplitude plays a prominent role in the time-dependent coupled-cluster calculation of response functions. {\textcopyright} 1983 The American Physical Society.},
author = {Dalgaard, Esper and Monkhorst, Hendrik J.},
doi = {10.1103/PhysRevA.28.1217},
issn = {10502947},
journal = {Physical Review A},
number = {3},
pages = {1217--1222},
title = {{Some aspects of the time-dependent coupled-cluster approach to dynamic response functions}},
volume = {28},
year = {1983}
}

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