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Electron spin resonance absorption has been found in the colored deposits formed by condensing heated sulfur vapor on cold surfaces. Complexities in the resonance spectrum give evidence for the existence in the cold deposits of at least two types of trapped sulfur radicals with differing degrees of internal magnetic anisotropy. Measurements of the intensity and stability of the resonance absorption yield information on the radical trapping process.
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Radford et al. (1960) studied this question.
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