Accession Number : ADP008285

Title :   Marker Mode Structure in the Primary Donor State of Bacterial Reaction Centers,

Corporate Author : IOWA STATE UNIV AMES DEPT OF CHEMISTRY

Personal Author(s) : Lyle, P. ; Small, G. J. ; DiMagno, T. J. ; Norris, J. R.

Report Date : 22 MAY 1992

Pagination or Media Count : 3

Abstract : Underlying structure for the primary donor absorption profiles of isolated reaction centers Rhodopseudomonas viridis and Rhodobacter sphaeroides (P960 and P870) has recently been uncovered by transient hole burning experiments. A Franck-Condon progression of an intermolecular special pair marker mode (omega sp) was found to originate in the low energy shoulder of the absorption spectra and peak at the one quantum transition. The theory of Hayes and Small for fitting hole burned spectra was extended to include the coupling of the marker mode. Briefly, the theory defines a single site absorption function as being made up of a sum of 0-,1-,... phonon lineshape functions composed of a gaussian distribution for the low energy side and a lorentzian for the high energy side. By constructing a gaussian distribution whose full-width at half maximum is equal to the inhomogeneous broadening and convolving with the single site absorption function, the absorption spectrum is obtained. By further convolving these functions with an exponential decay function of the single sites centered at the burn frequency the absorption spectra after burning a time Tau is obtained.

Descriptors :   *ABSORPTION SPECTRA, *MARKERS, *PHONONS, *BACTERIA, ABSORPTION, COUPLINGS, DECAY, ENERGY, FITTINGS, FREQUENCY, FUNCTIONS, HIGH ENERGY, LOW ENERGY, PROFILES, SITES, SPECTRA, STRUCTURES, THEORY, TIME, TRANSIENTS, TRANSITIONS, WIDTH, DONORS(MEDICINE), LORENTZ FORCE.

Subject Categories : Solid State Physics
      Microbiology
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE