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Combining Polarizable Embedding with the Frenkel Exciton Model: Applications to Absorption Spectra with Overlapping Solute-Solvent Bands

preprint
submitted on 24.12.2018 and posted on 03.01.2019 by Julie Stendevad, Jacob Kongsted, Casper Steinmann
Modeling of spectral properties of extended chemical systems, such as the case of a solute in a solvent, is often performed based on so-called hybrid models in which only part of the complete system is given a quantum chemical description. The remaining part of the system is represented by an embedding potential treating the environment either by a discrete or continuum model. In order to successfully make use of minimally sized quantum chemical regions, the
embedding potential should represent the environment as authentic as possible. Here, the importance of exactly such an accurate description of the embedding potential is investigated by comparing the performance of the Polarizable Embedding scheme against larger sized full quantum mechanical calculations. Our main conclusion is that as long as the solute and solvent do not overlap in their absorption spectra, the Polarizable Embedding approach shows results consistent with full quantum chemical calculations. For partly overlapping absorption spectra the Polarizable Embedding approach can furthermore successfully be expanded within a Frenkel exciton approach based on only economical monomeric quantum chemical calculations. Thus, by extending the Polarizable Embedding scheme to the exciton picture it is possible to cover computations of the whole absorption spectrum and
still reduce the computational cost compared to costly cluster calculations.

Funding

DFF-4181-00370

DFF-7014-00050B

Training network for COmputational Spectroscopy In Natural sciences and Engineering

History

Email Address of Submitting Author

css@bio.aau.dk

Institution

Aalborg University

Country

Denmark

ORCID For Submitting Author

0000-0002-5638-1346

Declaration of Conflict of Interest

no conflict of interest

Licence

Exports