Two-photon excitation spectroscopy of thylakoid membranes from Phaeodactylum tricornutum: Evidence for an in vivo two-photon-allowed carotenoid state

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Abstract

One- and two-photon excitation profiles for chlorophyll a emission in thylakoid membranes of Phaeodactylum tricornutum are reported. Active two-photon response is revealed with excitation in the carotenoid spectral region. Interpretations are given in terms of alternative descriptions of in vivo carotenoid electronic states.

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