Impact of High-Dielectric-Loss Materials on the Microwave Field in EPR Experiments |
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| Institution: | 1. Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan;2. Department of Chemistry, National Taiwan University, Taiwan;1. Department of Physics, Dr. Ambedkar College, Deekashbhoomi, Nagpur, 440010, India;2. D. B. Science College, Gondia, 441601, India;3. Rajiv Gandhi College of Engineering, 442403, Chandrapur, India;1. Opto & Mechatronics Solution Division, Samsung Elctro-mechanics, Suwon 443-743, Republic of Korea;2. Composites Research Center, Korea Institute of Materials Science, Changwon 642-831, Republic of Korea;3. Dept. of Physics, Pusan National University, Busan 609-735, Republic of Korea;4. Dept. of Materials Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea;1. Department of Physics, Govt.Science College, Chitradurga-577501, Karnataka, India;2. Department of Materials Science, University of Mysore, Mysore-570005, India;3. Department of Applied Science, Haldia Institute of Technology, Haldia-721657, India;1. Wageningen Food & Biobased Research, Bornse Weilanden 9, Wageningen, The Netherlands;2. PepsiCo R&D, 4 Leycroft Road, Leicester, United Kingdom;1. Radiation Oncology Department, Centre Hospitalier Universitaire Vaudois—CHUV, Lausanne, Switzerland;2. Nuclear Medicine and Molecular Medicine Department, Centre Hospitalier Universitaire Vaudois—CHUV, Lausanne, Switzerland |
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| Abstract: | A dielectric material distorts the microwave field inside an EPR resonator, which results in distortion of the EPR signal from spins inside the material. In this paper, the effects of a spherical bulb filled with a dielectric liquid such as water or a water–ethanol mixture were examined. EPR spectra were recorded for small samples inside and outside of the sphere. The studies include CW and ESE experiments at two microwave frequencies, X band (9.2 GHz) and L band (1.03 GHz). The double integral (area) of an EPR signal depends onformula]at the position of the sample, causing a large difference in EPR signal intensities between samples in regions of different dielectrics. The phase of the EPR signal also is affected by the presence of the dielectric. These results were compared with three methods of calculating electromagnetic fields (quasi-static method, plane-wave-superposition method, and numerical analysis). Good agreement was found between experimental and calculated results. |
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