Excitonic and Vibrational Coherence in the Excitation Relaxation Process of Two LH1 Complexes as Revealed by Two-Dimensional Electronic Spectroscopy

Fei Ma, Long-Jiang Yu, Ruud Hendrikx, Zheng-Yu Wang-Otomo, Rienk van Grondelle

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Ultrafast excitation relaxation within a manifold exciton state and longlived vibrational coherence are two universal characteristics of photosynthetic antenna complexes. In this work, we studied the two-dimensional electronic spectra of two core light-harvesting (LH1) complexes of Thermochromatium (Tch.) tepidum, native Ca2+-LH1 and modified Ba2+-LH1. The role of the vibrational coherence in the exciton relaxation was revealed by comparing the two LH1 with similar structures but different electronic properties and by the evolution of the exciton and vibrational coherence as a function of temperature.
Original languageEnglish
Pages (from-to)2751-2756
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number12
Publication statusPublished - 15 Jun 2017

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