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Issue 29, 2015
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Vibronic energy relaxation approach highlighting deactivation pathways in carotenoids

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Abstract

Energy relaxation between two electronic states of a molecule is mediated by a set of relevant vibrational states. We describe this fundamental process in a fully quantum mechanical framework based on first principles. This approach explains population transfer rates as well as describes the entire transient absorption signal as vibronic transitions between electronic states. By applying this vibronic energy relaxation approach to carotenoids, we show that β-carotene's transient absorption signal can be understood without invoking the intensely debated S* electronic state. For a carotenoid with longer chain length, we find that vibronic energy relaxation does not suffice to explain all features in the transient absorption spectra, which we relate to an increased ground state structural inhomogeneity. Our modeling approach is generally applicable to photophysical deactivation processes in molecules. As such, it represents a well-founded alternative to data fitting techniques such as global target analysis.

Graphical abstract: Vibronic energy relaxation approach highlighting deactivation pathways in carotenoids

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Supplementary files

Article information


Submitted
10 Feb 2015
Accepted
29 Jun 2015
First published
30 Jun 2015

Phys. Chem. Chem. Phys., 2015,17, 19491-19499
Article type
Paper
Author version available

Vibronic energy relaxation approach highlighting deactivation pathways in carotenoids

V. Balevičius, A. G. Pour, J. Savolainen, C. N. Lincoln, V. Lukeš, E. Riedle, L. Valkunas, D. Abramavicius and J. Hauer, Phys. Chem. Chem. Phys., 2015, 17, 19491
DOI: 10.1039/C5CP00856E

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