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Issue 24, 2018
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COSMO-RI-ADC(2) excitation energies and excited state gradients

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We present an implementation of analytic gradients for electronically excited states for the algebraic-diagrammatic construction through second order, ADC(2), in combination with the conductor-like screening model (COSMO) as an implicit solvent model. The implementation uses a post-SCF reaction field scheme for the coupling between the environment and the quantum system which retains the computational efficiency of the gas-phase RI-ADC(2) calculations. Applying this approach, we computed solvatochromic shifts for UV absorption and fluorescence transitions of 4-(N,N-dimethylamino)benzonitrile using equilibrium geometries for the ground and the first excited states optimized in the presence of acetonitrile as solvent. Furthermore, we investigated the excited state energies and geometries of the 2-iodobenzimidazolium·triflate ion pair in aqueous solution as an example where solvent effects have a large influence on the structure and the UV spectrum.

Graphical abstract: COSMO-RI-ADC(2) excitation energies and excited state gradients

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Article information

29 Jan 2018
19 Apr 2018
First published
20 Apr 2018

Phys. Chem. Chem. Phys., 2018,20, 16354-16363
Article type

COSMO-RI-ADC(2) excitation energies and excited state gradients

S. Karbalaei Khani, A. Marefat Khah and C. Hättig, Phys. Chem. Chem. Phys., 2018, 20, 16354
DOI: 10.1039/C8CP00643A

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