We introduce a new method to compute the optical absorption spectra of complex molecular systems in solution, based on the Liouville approach to time-dependent density-functional perturbation theory and the revised self-consistent continuum solvation model. The former allows one to obtain the absorption spectrum over a whole wide frequency range, using a recently proposed Lanczos-based technique, or selected excitation energies, using the Casida equation, without having to ever compute any unoccupied molecular orbitals. The latter is conceptually similar to the polarizable continuum model and offers the further advantages of allowing an easy computation of atomic forces via the Hellmann-Feynman theorem and a ready implementation in periodic-boundary conditions. The new method has been implemented using pseudopotentials and plane-wave basis sets, benchmarked against polarizable continuum model calculations on 4-aminophthalimide, alizarin, and cyanin and made available through the Quantum ESPRESSO distribution of open-source codes.

Self-consistent continuum solvation for optical absorption of complex molecular systems in solution / Timrov, Iurii; Andreussi, Oliviero; Biancardi, Alessandro; Marzari, Nicola; Baroni, Stefano. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 142:3(2015), pp. 1-9. [10.1063/1.4905604]

Self-consistent continuum solvation for optical absorption of complex molecular systems in solution

Timrov, Iurii;Biancardi, Alessandro;Baroni, Stefano
2015-01-01

Abstract

We introduce a new method to compute the optical absorption spectra of complex molecular systems in solution, based on the Liouville approach to time-dependent density-functional perturbation theory and the revised self-consistent continuum solvation model. The former allows one to obtain the absorption spectrum over a whole wide frequency range, using a recently proposed Lanczos-based technique, or selected excitation energies, using the Casida equation, without having to ever compute any unoccupied molecular orbitals. The latter is conceptually similar to the polarizable continuum model and offers the further advantages of allowing an easy computation of atomic forces via the Hellmann-Feynman theorem and a ready implementation in periodic-boundary conditions. The new method has been implemented using pseudopotentials and plane-wave basis sets, benchmarked against polarizable continuum model calculations on 4-aminophthalimide, alizarin, and cyanin and made available through the Quantum ESPRESSO distribution of open-source codes.
2015
142
3
1
9
034111
https://aip.scitation.org/doi/10.1063/1.4905604
Timrov, Iurii; Andreussi, Oliviero; Biancardi, Alessandro; Marzari, Nicola; Baroni, Stefano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/70091
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