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01552nam a2200181Ia 4500 |
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10.11113-MJFAS.V17N6.2461 |
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220427s2021 CNT 000 0 und d |
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|a 2289599X (ISSN)
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|a A Rudimentary X band CW-EPR Spectrometer Based on FPGA
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|b Penerbit UTM Press
|c 2021
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|z View Fulltext in Publisher
|u https://doi.org/10.11113/MJFAS.V17N6.2461
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|a A rudimentary Electron Paramagnetic Resonance (EPR) spectrometer is designed using a field programmable gate array (FPGA) equipped with two digital-to-analog (DAC) and two analog-to-digital (ADC) channels. The single stage heterodyne setup operates at X band frequencies and is used to detect EPR signals from 2,2-diphenyl-1-picrylhydrazyl (DPPH) in a loop-gap resonator. We design the loop gap resonator with 3 loops 2 gaps for high field homogeneity and moderate Q-factor. The resonator is coupled capacitively to the coaxial cable and is designed to have an unloaded resonant frequency of 8.856 GHz with a Q-factor of 646.0 when critically coupled. The loaded resonant frequency is reported to be 8.668 GHz with a Q-factor of 615.8. Using this setup, EPR signal is successfully detected at 311.4 mT and 8.688 GHz with an experimental g-factor of 1.9945 ± 0.0012, which is very near to the standard value for DPPH. © Copyright Eow and Yap.
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|a Electron paramagnetic resonance
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|a EPR spectrometer
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|a Resonator
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|a Eow, W.S.
|e author
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|a Yap, Y.S.
|e author
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| 773 |
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|t Malaysian Journal of Fundamental and Applied Sciences
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