Transient lens spectroscopy of ultrafast internal conversion processes in citranaxanthin

An attempt is made to study the ultrafast internal conversion (IC) dynamics of the apocarotenoid citranaxanthin for the first time by means of two-color transient lens (TL) pump-probe spectroscopy. It is suggested that the S1 lifetime [tau.sub.1] varies slightly between solvents 10-12 ps and the only clear decrease is observed for methanol.