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DNP and ESR at 5 T Fields

  • T. F. Prisner
  • S. Un
  • R. T. Weber
  • A. C. McDermott
  • D. J. Singel
  • R. G. Griffin
Conference paper

Abstract

Room temperature dynamic nuclear polarization (DNP) measurements on the ID organic conductor fluoranthenyl radical cation salt (FA) are reported. Magic angle spinning (MAS) and 1h/13c cross polarization (CP) were employed to detect the enhanced 13c signals from powder samples. A enhancement factor of 8 was achieved by pulsed microwave excitation of the electronic spin system. A theoretical description of this pulsed technique has been developed and a comparison to CW method is made. ESR spectra of the P700+-donor radical of photosystem I (PS I) at room temperature demonstrate the benefits of high fields: the increased spectral resolution and measurement of small g-anisotropies.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • T. F. Prisner
    • 1
  • S. Un
    • 1
  • R. T. Weber
    • 1
    • 2
  • A. C. McDermott
    • 1
  • D. J. Singel
    • 3
  • R. G. Griffin
    • 1
  1. 1.Francis Bitter National Magnet Laboratory and Dept. of ChemistryMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Bruker Instr.Manning Park, BillericaUSA
  3. 3.Dept. of ChemistryHarvard UniversityCambridgeUSA

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