electron paramagnetic resonance

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electron paramagnetic resonance

n
(General Physics) physics another name for electron spin resonanceAbbreviation: EPR
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Noun1.electron paramagnetic resonance - microwave spectroscopy in which there is resonant absorption of radiation by a paramagnet
microwave spectroscopy - the use of spectroscopy to study atomic or molecular resonances in the microwave spectrum
References in periodicals archive ?
But there is no signal in the ESR spectrum of W[O.sub.3], implying that the sample of W[O.sub.3] was completely oxidized.
The ESR spectrum of irradiated dosimeters was recorded with a JEOL FA200 X-band spectrometer (Japan) at room temperature, at least 72 h post-irradiation with the following parameters: 2 mW microwave power, 348 mT central field and sweep width of 10 mT, a modulation amplitude of 0.6 mT, a time constant of 0.3 s, and a scan time of 1 min.
The ESR spectrum of [Na.sub.2] S[O.sub.4] recorded at RT after [gamma]- irradiation is typical powder spectra of spin 1/2 paramagnetic centres with anisotropic g-value (Figure 5).
The ESR spectrum at 10kGy dose shows an incompletely resolved and slightly asymmetric hyperfine structure located around g =2.014 [+ or -] 0.001 and g=2.021 [+ or -] 0.001, and hyperfine parameters [a.sub.1]= 18x10[sup.4]T and [a.sub.2]= 19x10-[sup.4T,] respectively (Table I) ascribed to peroxide radical (Ranby and Rabek, 1977; Reyes et al., 2003), which could be rapidly transformed into carbonyl groups in the presence of air (Reyes et al., 2003) At 25 and 50kGy the ESR spectra parameters 'g' and 'a' reflect the presence of peroxide radicals (Ranby and Rabek, 1977).
The results of the ESR spectrum of DPPH radical scavenging assay indicates that the pepsin hydrolysate of ribbon fish (Figure II b) shows higher antioxidant activity than the seela fish (Figure II c) when compared with that of the control (Figure II a).