Second-order variational coupled-cluster linear-response method: A Hermitian time-dependent theory
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitaetsstrasse 31, D-93040 Regensburg (Germany)
The formalism is presented for the linear response of a time-dependent (TD) variational coupled cluster (VCC), truncated according to Moeller-Plesset perturbation theory, i.e., a TD-VCC[n] linear response, where n denotes the order of the corresponding quasienergy with respect to the fluctuation potential. The resulting eigenvalue problem determining the excitation energies is Hermitian and of the simple Tamm-Dancoff form. The VCC excitation energies are equivalent to those of the configuration-interaction singles (CIS) model, while the Casida equation for the TD-Hartree-Fock approach is an approximation to it. The TD-VCC response, the lowest-order method including electron correlation, is discussed in detail and the relations to other second-order methods, such as the CC2 linear response and the algebraic diagrammatic construction at second order [ADC(2)] are explored.
- OSTI ID:
- 21550092
- Journal Information:
- Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.062503; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
CLUSTER MODEL
CONFIGURATION INTERACTION
EIGENVALUES
ELECTRON CORRELATION
EXCITATION
FLUCTUATIONS
HARTREE-FOCK METHOD
HERMITE POLYNOMIALS
PERTURBATION THEORY
POTENTIALS
TIME DEPENDENCE
VARIATIONAL METHODS
APPROXIMATIONS
CALCULATION METHODS
CORRELATIONS
ENERGY-LEVEL TRANSITIONS
FUNCTIONS
MATHEMATICAL MODELS
NUCLEAR MODELS
POLYNOMIALS
VARIATIONS