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RESEARCH PRODUCT
Calculation of size‐intensive transition moments from the coupled cluster singles and doubles linear response function
Poul JoHenrik KochRgensenRika KobayashiAlfredo Sánchez De Merássubject
DipolesGeneral Physics and AstronomySmall systemsExcitation ; Dipoles ; Lithium Hydrides ; Carbynes ; Cations ; Molecular Ions ; Carbon Molecules ; Equations Of Motion ; Correlations ; Response FunctionsPhysics and Astronomy (all)CationsMoleculePhysical and Theoretical Chemistry:FÍSICA::Química física [UNESCO]ExcitationCorrelationsChemistryEquations of motionCarbon MoleculesLinear response functionUNESCO::FÍSICA::Química físicaFormalism (philosophy of mathematics)DipoleCoupled clusterLithium HydridesCarbynesResponse FunctionsAtomic physicsEquations Of MotionMolecular IonsExcitationdescription
Coupled cluster singles and doubles linear response (CCLR) calculations have been carried out for excitation energies and dipole transition strengths for the lowest excitations in LiH, CH+, and C4and the results compared with the results from a CI-like approach to equation of motion coupled cluster (EOMCC). The transition strengths are similar in the two approaches for single molecule calculations on small systems. However, the CCLR approach gives size-intensive dipole transition strengths, while title EOMCC formalism does not. Thus, EOMCC calculations can give unphysically dipole transition strengths, e.g., in EOMCC calculations on a sequence of noninteracting LiH systems we obtained a negative dipole strength for the lowest totally symmetric dipole allowed transition for 19 or more noninteracting LiH systems. The CCLR approach is shown to be a very attractive "black box" approach for the calculation of transition moments. © 1994 American Institute of Physics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-03-15 | The Journal of Chemical Physics |