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Supporting information for vibrational frequencies of fractionally charged molecular species: benchmarking DFT results against ab initio calculations

Recent advances in nano/molecular electronics and electrochemistry made it possible to continuously tune the fractional charge q of single molecules and to use vibrational spectroscopic methods to monitor such changes. Approaches to compute vibrational frequencies ω(q) of fractionally charged specie...

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1. Verfasser: Bâldea, Ioan (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 13 March 2017
In: The journal of physical chemistry. A, Molecules, clusters, and aerosols
Year: 2017, Jahrgang: 121, Heft: 11, Pages: 2282-2287
ISSN:1520-5215
DOI:10.1021/acs.jpca.6b12946
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1021/acs.jpca.6b12946
Verlag, Volltext: https://doi.org/10.1021/acs.jpca.6b12946
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Verfasserangaben:Ioan Bâldea

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520 |a Recent advances in nano/molecular electronics and electrochemistry made it possible to continuously tune the fractional charge q of single molecules and to use vibrational spectroscopic methods to monitor such changes. Approaches to compute vibrational frequencies ω(q) of fractionally charged species based on the density functional theory (DFT) are faced with an important issue: the basic quantity used in these calculations, the total energy, should exhibit piecewise linearity with respect to the fractional charge, but approximate, commonly utilized exchange correlation functionals do not obey this condition. In this paper, with the aid of a simple and representative example, we benchmark results for ω(q) obtained within the DFT against ab initio methods, namely, coupled cluster singles and doubles and also second- and third-order Møller-Plesset perturbation) expansions. These results indicate that, in spite of missing the aforementioned piecewise linearity, DFT-based values ω(q) can reasonably be trusted. 
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