Transient lens spectroscopy of ultrafast internal conversion processes in citranaxanthin

The Journal of Physical Chemistry. a
Thomas LenzerMarco T Seidel

Abstract

The ultrafast internal conversion (IC) dynamics of the apocarotenoid citranaxanthin have been studied for the first time by means of two-color transient lens (TL) pump-probe spectroscopy. After excitation into the high-energy edge of the S2 band by a pump pulse at 400 nm, the subsequent intramolecular processes were probed at 800 nm. Experiments were performed in a variety of solvents at room temperature. Upper limits for the S2 lifetime tau2 on the order of 100-200 fs are estimated. The S1 lifetime tau1 varies only slightly between solvents (10-12 ps), and the only clear decrease is observed for methanol (8.5 ps). The findings are consistent with earlier results from transient absorption studies of other apocarotenoids and carotenoid ketones and transient lens experiments of C40 carbonyl carotenoids. Possible reasons for the observed weak solvent dependence of tau1 for citranaxanthin are discussed.

References

Apr 15, 2004·Chemical Reviews·Tomás Polívka, Villy Sundström
Apr 25, 2006·The Journal of Physical Chemistry. a·Philipp KukuraRichard A Mathies
Jul 13, 2006·The Journal of Physical Chemistry. a·Robielyn P IlaganHarry A Frank
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Sep 1, 1989·Optics Letters·M Sheik-BahaeE W Van Stryland

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Citations

May 25, 2006·Physical Chemistry Chemical Physics : PCCP·Duncan A WildThomas Lenzer
Dec 17, 2008·Archives of Biochemistry and Biophysics·Thomas LenzerKawon Oum
Apr 12, 2008·Physical Chemistry Chemical Physics : PCCP·Sebastian StalkeKawon Oum
Jan 15, 2009·The Journal of Physical Chemistry. a·Jimena S ZugazagoitiaJorge Peon
Nov 2, 2017·The Journal of Physical Chemistry. a·Mirko ScholzKawon Oum
Feb 16, 2008·The Journal of Physical Chemistry. B·Peter W LohseKawon Oum

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