Double resonance calibration of g factor standards: Carbon fibers as a high precision standard
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
The g factor of paramagnetic defects in commercial high performance carbon fibers was determined by a double resonance experiment based on the Overhauser shift due to hyperfine coupled protons. Our carbon fibers exhibit a single, narrow and perfectly Lorentzian shaped ESR line and a g factor slightly higher than gfree with g=2.002644=gfree·(1+162ppm) with a relative uncertainty of 15ppm. This precisely known g factor and their inertness qualify them as a high precision g factor standard for general purposes. The double resonance experiment for calibration is applicable to other potential standards with a hyperfine interaction averaged by a process with very short correlation time Show more
Journal / seriesJournal of Magnetic Resonance
Pages / Article No.
Subjectg factor; Calibration; g standard; Chemical shift; Chemical shielding; Overhauser DNP; High-field EPR
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