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• W2023583325 startingPage "233" @default.
• W2023583325 abstract "A frequency modulation (FM) method was developed to measure electron paramagnetic resonance (EPR) absorption. The first-derivative spectrum of 1,1-diphenyl-2-picrylhydrazyl (DPPH) powder was measured with this FM method. Frequency modulation of up to 1.6 MHz (peak-to-peak) was achieved at a microwave carrier frequency of 1.1 GHz. This corresponds to a magnetic field modulation of 57microT (peak-to-peak) at 40.3 mT. By using a tunable microwave resonator and automatic control systems, we achieved a practical continuous-wave (CW) EPR spectrometer that incorporates the FM method. In the present experiments, the EPR signal intensity was proportional to the magnitude of frequency modulation. The background signal at the modulation frequency (1 kHz) for EPR detection was also proportional to the magnitude of frequency modulation. An automatic matching control (AMC) system reduced the amplitude of noise in microwave detection and improved the baseline stability. Distortion of the spectral lineshape was seen when the spectrometer settings were not appropriate, e.g., with a lack of the open-loop gain in automatic tuning control (ATC). FM is an alternative to field modulation when the side-effect of field modulation is detrimental for EPR detection. The present spectroscopic technique based on the FM scheme is useful for measuring the first derivative with respect to the microwave frequency in investigations of electron-spin-related phenomena." @default.
• W2023583325 created "2016-06-24" @default.
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• W2023583325 creator A5044895844 @default.
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• W2023583325 date "2003-10-01" @default.
• W2023583325 modified "2023-10-16" @default.
• W2023583325 title "Detection of electron paramagnetic resonance absorption using frequency modulation" @default.
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• W2023583325 doi "https://doi.org/10.1016/s1090-7807(03)00236-2" @default.
• W2023583325 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14511592" @default.
• W2023583325 hasPublicationYear "2003" @default.
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