Benchmarking two-photon absorption with CC3 quadratic response theory, and comparison with density-functional response theory
2006 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 124, no 5, 425-430 p.Article in journal (Refereed) Published
We present a detailed study of the effects of electron correlation on two-photon absorption calculated by coupled cluster quadratic response theory. The hierarchy of coupled cluster models CCS, CC2, CCSD, and CC3 has been used to investigate the effects of electron correlation on the two-photon absorption cross sections of formaldehyde (CH2O), diacetylene (C4H2), and water (H2O). In particular, the effects of triple excitations on two-photon transition cross sections are determined for the first time. In addition, we present a detailed comparison of the coupled cluster results with those obtained from Hartree-Fock and density-functional response theories. We have investigated the local-density approximation, the pure Becke-Lee-Yang-Parr (BLYP) functional, the hybrid Becke-3-parameter-Lee-Yang-Parr (B3LYP), and the Coulomb-attenuated B3LYP (CAM-B3LYP) functionals. Our results show that the CAM-B3LYP functional, when used in conjuction with a one-particle basis-set containing diffuse functions, has much promise; however, care must still be exercised for diffuse Rydberg-type states.
Place, publisher, year, edition, pages
2006. Vol. 124, no 5, 425-430 p.
full configuration-interaction, coupled-cluster calculations, frequency-dependent polarizabilities, multiphoton transition moments, probability rate constants, triples model cc3, cross-sections, 1st hyperpolarizabilities, excitation-energies, singlet oxygen
IdentifiersURN: urn:nbn:se:kth:diva-15413DOI: 10.1063/1.2163874ISI: 000235171100040ScopusID: 2-s2.0-32044432133OAI: oai:DiVA.org:kth-15413DiVA: diva2:333454
QC 201005252010-08-052010-08-05Bibliographically approved