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

doi:10.1021/acs.jpclett.7b00824

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

J Phys Chem Lett. 2017 Jun 15;8(12):2751-2756. doi: 10.1021/acs.jpclett.7b00824. Epub 2017 Jun 7.

Authors

Fei Ma¹, Long-Jiang Yu^{2

3}, Ruud Hendrikx¹, Zheng-Yu Wang-Otomo², Rienk van Grondelle¹

Affiliations

¹ Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam , De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
² Faculty of Science, Ibaraki University , Mito, Ibaraki 310-8512, Japan.
³ Research Institute for Interdisciplinary Science, Okayama University , 3-1-1 Tsushima Naka, Okayama 700-8530, Japan.

PMID: 28585830
DOI: 10.1021/acs.jpclett.7b00824

Abstract

Ultrafast excitation relaxation within a manifold exciton state and long-lived 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.