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Efficient calculation of electronic absorption spectra by means of intensity-selected time-dependent density functional tight binding

Ruger R, Van Lenthe E, Lu Y, Frenzel J, Heine T, Visscher L (2015)

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Publication Type: Journal article

Publication year: 2015

Journal

Book Volume: 11

Pages Range: 157-167

Journal Issue: 1

DOI: 10.1021/ct500838h

Abstract

During the last two decades density functional based linear response approaches have become the de facto standard for the calculation of optical properties of small- and medium-sized molecules. At the heart of these methods is the solution of an eigenvalue equation in the space of single-orbital transitions, whose quickly increasing number makes such calculations costly if not infeasible for larger molecules. This is especially true for time-dependent density functional tight binding (TD-DFTB), where the evaluation of the matrix elements is inexpensive. For the relatively large systems that can be studied the solution of the eigenvalue equation therefore determines the cost of the calculation. We propose to do an oscillator strength based truncation of the single-orbital transition space to reduce the computational effort of TD-DFTB based absorption spectra calculations. We show that even a sizable truncation does not destroy the principal features of the absorption spectrum, while naturally avoiding the unnecessary calculation of excitations with small oscillator strengths. We argue that the reduced computational cost of intensity-selected TD-DFTB together with its ease of use compared to other methods lowers the barrier of performing optical property calculations of large molecules and can serve to make such calculations possible in a wider array of applications. (Graph Presented).

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How to cite

APA:

Ruger, R., Van Lenthe, E., Lu, Y., Frenzel, J., Heine, T., & Visscher, L. (2015). Efficient calculation of electronic absorption spectra by means of intensity-selected time-dependent density functional tight binding. Journal of Chemical Theory and Computation, 11(1), 157-167. https://doi.org/10.1021/ct500838h

MLA:

Ruger, Robert, et al. "Efficient calculation of electronic absorption spectra by means of intensity-selected time-dependent density functional tight binding." Journal of Chemical Theory and Computation 11.1 (2015): 157-167.

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