Nuclear coherences in photosynthetic reaction centers following light excitation
- Univ. of Chicago, IL (United States). Dept. of Chemistry
- Univ. of Freiburg (Germany). Dept. of Physical Chemistry
- Argonne National Lab., IL (United States). Chemistry Div.
Transient electron paramagnetic resonance is used to study the secondary radical pair in plant photosystem I. Nuclear coherences are observed in the transverse magnetization at lower temperatures following light excitation. Comparative studies of deuterated and deuterated {sup 15}N-substituted cyanobacteria S. lividus indicate assignment of these coherences to nitrogen nuclei in the primary donor and deuterons in the secondary acceptor. The modulation amplitude of a deuteron matrix line, as a function of the microwave power, reveals a distinct resonance behavior. The maximum amplitude is obtained when the Rabi frequency equals the nuclear Zeeman frequency.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); Deutsche Forschungsgemeinschaft, Bonn (Germany); Alexander von Humboldt-Stiftung, Bonn (Germany)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 515524
- Report Number(s):
- ANL/CHM/PP-88358; ON: DE97007872; TRN: AHC29718%%39
- Resource Relation:
- Other Information: PBD: [1997]
- Country of Publication:
- United States
- Language:
- English
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