Modified surface-coil-type resonators for EPR measurements of a thin membranelike sample |
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Authors: | H Yokoyama M Tada T Sato H Ohya T Akatsuka |
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Institution: | 1.Institute for Life Support Technology,Yamagata Public Corporation for Development of Industry,Yamagata,Japan;2.Regional Joint Research Project of Yamagata Prefecture,Japan Science and Technology Corporation,Yamagata,Japan;3.Yamagata Research Institute of Technology,Yamagata,Japan;4.Faculty of Engineering,Yamagata University,Yonezawa,Japan |
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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. |
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