Transient lens spectroscopy of ultrafast internal conversion processes in citranaxanthin.
J Phys Chem A
; 110(9): 3159-64, 2006 Mar 09.
Article
em En
| MEDLINE
| ID: mdl-16509639
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.
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Base de dados:
MEDLINE
Assunto principal:
Análise Espectral
/
Carotenoides
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article