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Issue 29, 2015
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Benchmarking two-photon absorption cross sections: performance of CC2 and CAM-B3LYP

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Abstract

We investigate the performance of CC2 and TDDFT/CAM-B3LYP for the calculation of two-photon absorption (TPA) strengths and cross sections and contrast our results to a recent coupled cluster equation-of-motion (EOM-EE-CCSD) benchmark study [K. D. Nanda and A. I. Krylov, J. Chem. Phys., 2015, 142, 064118]. In particular, we investigate whether CC2 TPA strengths are significantly overestimated compared to higher-level coupled-cluster calculations for fluorescent protein chromophores. Our conclusion is that CC2 TPA strengths are only slightly overestimated compared to the reference EOM-EE-CCSD results and that previously published overestimated cross sections are a result of inconsistencies in the conversion of the TPA strengths to macroscopic units. TDDFT/CAM-B3LYP TPA strengths, on the other hand, are found to be 1.5 to 3 times smaller than the coupled-cluster reference for the molecular systems considered. The unsatisfactory performance of TDDFT/CAM-B3LYP can be linked to an underestimation of excited-state dipole moments predicted by TDDFT/CAM-B3LYP.

Graphical abstract: Benchmarking two-photon absorption cross sections: performance of CC2 and CAM-B3LYP

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Article information


Submitted
04 Jun 2015
Accepted
25 Jun 2015
First published
25 Jun 2015

This article is Open Access

Phys. Chem. Chem. Phys., 2015,17, 19306-19314
Article type
Paper
Author version available

Benchmarking two-photon absorption cross sections: performance of CC2 and CAM-B3LYP

M. T. P. Beerepoot, D. H. Friese, N. H. List, J. Kongsted and K. Ruud, Phys. Chem. Chem. Phys., 2015, 17, 19306
DOI: 10.1039/C5CP03241E

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