Abstract
HIGH microwave frequencies may, with advantage, be measured by utilizing electron and proton paramagnetic resonances in a common magnetic field. For this purpose the free radical diphenyl trinitrophenyl hydrazyl, which has one of the strongest and narrowest lines yet reported1, is suitable for the electron resonance sample. The protons in water containing a trace of a paramagnetic salt provide the most suitable substance for the proton resonance.
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References
Phys. Rev., 75, 1614 (1949).
Phys. Rev., 73, 679 (1948).
Phys. Rev., 81, 282 (1951).
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NOURSE, O. A Frequency Comparator using Electron and Proton Resonance in a Common Magnetic Field. Nature 180, 192 (1957). https://doi.org/10.1038/180192a0
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DOI: https://doi.org/10.1038/180192a0
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