Theoretical calculation of femtosecond time-resolved spectra of initial electron transfer in photosynthetic reaction centers
- Arizona State Univ., Tempe, AZ (United States)
In this paper, we propose to study the dynamics and spectroscopy of photosynthetic reaction centers (RCs). We shall analyze the experimental femtosecond spectra of Rb. sphaeroides (R-26) which usually consist of contributions from populations and coherences. We shall extract information on vibrational relaxation, electron transfer (ET), and the vibrational modes involved in ET from the analysis of the femtosecond time-resolved spectra with pronounced coherence contributions. Conventional ET theory assumes that vibrational relaxation (VR) is much faster than ET so that the vibrational equilibrium is established before ET takes place. However, the primary ET in RCs occurs in 1-4 ps. This implies that this assumption should be examined. We shall study theoretically the effect of the excitation wavelength; that is, we shall study how the ET in RCs is affected by exciting to different vibronic states of RCs. In the dynamic aspect of primary ET in RCs, these experiments will provide us not only with the mechanism of ET but also with the vibrational relaxation of various modes involved in ET. In this case, it is necessary to know the expressions of single-vibronic level ET rate constants. This will also be presented in this paper. 45 refs., 6 figs., 1 tab.
- DOE Contract Number:
- FG02-88ER13969
- OSTI ID:
- 7044170
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:48; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization of the strongly coupled, low-frequency vibrational modes of the special pair of photosynthetic reaction centers via isotopic labeling of the cofactors
Electronic and nuclear dynamics of the accessory bacteriochlorophylls in bacterial photosynthetic reaction centers from resonance Raman intensities
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
59 BASIC BIOLOGICAL SCIENCES
ELECTRON TRANSFER
SPECTROSCOPY
PHOTOSYNTHETIC REACTION CENTERS
FRANCK-CONDON PRINCIPLE
MATHEMATICAL MODELS
PHOTOSYNTHETIC BACTERIA
RELAXATION
VIBRATIONAL STATES
BACTERIA
ENERGY LEVELS
EXCITED STATES
MICROORGANISMS
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400102 - Chemical & Spectral Procedures
550200 - Biochemistry