Temperature dependence of antenna excitation transport in native photosystem I particles. [Electronic energy transport (EET)]

Journal Article · Thu May 16 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100163a047· OSTI ID:6125383

Lyle, P A; Struve, W S ^[1]

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1. Ames Lab., IA (United States)

The temperature dependence of polarized photobleaching dynamics was investigated through 680-nm pump-probe experiments in the Chl a antenna of native photosystem 1 particles (Chl/P700 {approximately} 200) from spinach. The anisotropic decay time is lengthened by an order of magnitude (from {approximately}7 to {approximately}62 ps) when the temperature is reduced from 290 to 38 K; most of this increase occurs between 65 and 38 K. The occurrence of this transition temperature in the tens of kelvin reflects the participation of protein phonons in antenna EET. The isotopic decay kinetics are considerably less temperature sensitive, indicating that the anisotropic and isotropic decays stem from different energy-transfer processes with contrasting temperature dependence. The 38 K photobleaching spectrum at 5 ps exhibits considerably more weighting in the lower energy Chl a spectral forms than the room-temperature spectrum, suggesting that rapid spectral equilibration occurs in the photosystem 1 antenna. In light of the phonon frequency and electron-phonon coupling parameters determined in independent PSI-200 spectral hole-burning experiments, the quantitative temperature dependence int he anisotropic decay times is consistent with a theory for phonon-assisted EET in which the pertinent phonons are independent modes localized about the donor and acceptor chromophores.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6125383
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 95:10; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
SPINACH
ENERGY TRANSFER
FLUORESCENCE
MATHEMATICAL MODELS
PHONONS
PHOTOCHEMICAL REACTIONS
POLARIZED BEAMS
RELAXATION TIME
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THEORETICAL DATA
TIME DEPENDENCE
VISIBLE RADIATION
BEAMS
CHEMICAL REACTIONS
DATA
ELECTROMAGNETIC RADIATION
FOOD
INFORMATION
LUMINESCENCE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NUMERICAL DATA
PLANTS
QUASI PARTICLES
RADIATIONS
TEMPERATURE RANGE
VEGETABLES
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)