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Modified surface-coil-type resonators for EPR measurements of a thin membranelike sample

  • H. Yokoyama
  • M. Tada
  • T. Sato
  • H. Ohya
  • T. Akatsuka
Article

Abstract

Surface-coil-type resonators (SCRs) equipped with a circular single-tum coil (conventional SCR), a circular spiral coil (spiral SCR), and a plate-type single-turn coil (plate-type SCR) were fabricated. By using these SCRs, the electron paramagnetic resonance (EPR) sensitivities of thin membranelike samples were investigated. For a non-dielectric-loss phantom, filter paper containing 1,1-diphenyl-2-picrylhydrazyl was used. For a high-dielectric-loss phantom, gauze containing an aqueous solution of 3-carbamoyl-2,2,5,5-tetramethylpyrrolidine-1-oxyl (carbamoyl-PROXYL) was used. For a biological sample, a pea leaf impregnated with the carbamoyl-PROXYL solution was used. The sensitivity (signal-to-noise ratio) of the spiral and plate-type SCRs for the non-dielectric-loss phantom was significantly greater than that of the conventional SCR. Under these conditions, the sensitivity of the spiral SCR was relatively higher than that of the plate-type SCR. For the high-dielectric-loss phantom, the sensitivity of the plate-type SCRs was significantly greater than that of the conventional SCR, but there were no differences in sensitivity between the spiral and conventional SCRs. The sensitivity of the plate-type SCR in the EPR measurement of a pea leaf was significantly greater than that of the conventional SCR. These findings show that the spiral and plate-type SCRs are suitable for measuring EPR of thin membranelike samples, especially when the former is used for the non-dielectric-loss sample and the latter for high-dielectric-loss sample, including the leaf.

Keywords

Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Input Impedance Electron Paramagnetic Resonance Measurement Electron Paramagnetic Resonance Spectrometer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2003

Authors and Affiliations

  • H. Yokoyama
    • 1
  • M. Tada
    • 2
  • T. Sato
    • 3
  • H. Ohya
    • 1
  • T. Akatsuka
    • 1
    • 4
  1. 1.Institute for Life Support TechnologyYamagata Public Corporation for Development of IndustryYamagataJapan
  2. 2.Regional Joint Research Project of Yamagata PrefectureJapan Science and Technology CorporationYamagataJapan
  3. 3.Yamagata Research Institute of TechnologyYamagataJapan
  4. 4.Faculty of EngineeringYamagata UniversityYonezawaJapan

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