| Popis: |
A time domain of particular interest in the study of photosynthetic charge separation is from 5 to 100 ns after the initiation of primary photochemistry within the reaction center. This regime is especially significant to the magnetic resonance spectroscopist because, although charge separation has proceeded to a radical pair state, the electrons on the radicals remain close enough to interact with each other magnetically during this time. Such magnetic interactions largely govern the fate of the radical pair state when the charges recombine; however, the dynamic evolution of the state occurs too quickly to be directly observable with the EPR, ENDOR, or ESE (electronspin echo) techniques. By using optically detected magnetic resonance (ODMR) and reaction yield-detected magnetic resonance (RYDMR), however, the time resolution necessary to observe short-lived paramagnetic states of the bacterial reaction center can be achieved, starting at about 5 ns. |
