REAL

Two-Dimensional Spectroscopy of Chlorophyll a Excited-State Equilibration in Light-Harvesting Complex II

Akhtar, Parveen and Zhang C, C. and Do, T. N. and Garab, Győző and Lambrev, Petar (2017) Two-Dimensional Spectroscopy of Chlorophyll a Excited-State Equilibration in Light-Harvesting Complex II. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 8 (1). pp. 257-263. ISSN 1948-7185

[img]
Preview
Text
AkhtarJPhysChemLettmanu.pdf

Download (2MB) | Preview

Abstract

Excited-state relaxation dynamics and energy-transfer processes in the chlorophyll a (Chl a) manifold of the light-harvesting complex II (LHCII) were examined at physiological temperature using femtosecond two-dimensional electronic spectroscopy (2DES). The experiments were done under conditions free from singlet-singlet annihilation and anisotropic decay. Energy transfer between the different domains of the Chl a manifold was found to proceed on time scales from hundreds of femtoseconds to five picoseconds, before reaching equilibration. No component slower than 10 ps was observed in the spectral equilibration dynamics. We clearly observe the bidirectional (uphill and downhill) energy transfer of the equilibration process between excited states. This bidirectional energy flow, although implicit in the modeling and simulation of the EET processes, has not been observed in any prior transient absorption studies. Furthermore, we identified the spectral forms associated with the different energy transfer lifetimes in the equilibration process.

Item Type: Article
Uncontrolled Keywords: GREEN PLANTS; HIGHER-PLANTS; PROTEIN COMPLEX; ROOM-TEMPERATURE; CRYSTAL-STRUCTURE; PHOTOSYSTEM-II; LHC-II; TRANSFORM ELECTRONIC SPECTROSCOPY; EXCITATION-ENERGY TRANSFER; TRANSIENT ABSORPTION-SPECTROSCOPY
Subjects: Q Science / természettudomány > QK Botany / növénytan
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 25 Jan 2018 13:32
Last Modified: 31 Jan 2018 00:15
URI: http://real.mtak.hu/id/eprint/73336

Actions (login required)

View Item View Item