These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
exciton.pdf (522.47 kB)

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

submitted on 24.12.2018, 08:39 and posted on 03.01.2019, 15:32 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.




Training network for COmputational Spectroscopy In Natural sciences and Engineering


Email Address of Submitting Author


Aalborg University



ORCID For Submitting Author


Declaration of Conflict of Interest

no conflict of interest