Transient absorption study of peridinin and peridinin-chlorophyll a-protein after two-photon excitation

Patricia A. Linden, Jörg Zimmermann, Tobias Brixner, Nancy E. Holt, Harsha M. Vaswani, Roger G. Hiller, Graham R. Fleming*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

Two-photon excited pump-probe spectroscopy was carried out on the peridinin-chlorophyll a-protein complex (PCP) and on the peridinin molecule in methanol solution. Our data are consistent with earlier two-photon fluorescence excitation spectra 1,2 and lead to the conclusion that, for peridinin in methanol solution, a separate two-photon-allowed transition exists just to the red of the strongly allowed S 0 - S 2(B u +) band. In the PCP complex, two-photon excitation at 1150 nm can also be interpreted as preparing a new state. In both cases, the new state is most likely the S 1(A g -) state. It is not yet possible to conclude experimentally whether peridinin possesses a single low lying state with solvent dependent properties or two distinct states, the A g - and the charge transfer states.

Original languageEnglish
Pages (from-to)10340-10345
Number of pages6
JournalJournal of Physical Chemistry B
Volume108
Issue number29
DOIs
Publication statusPublished - 22 Jul 2004

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