Abstract
DURING a search for stable free radicals in airborne dust by means of electron spin resonance, strong broad signals were consistently observed. The absorption lines (Fig. 1) had an approximately Lorentzian form with a width of about 400 gauss (measured between the peaks of the derivative curves) and remained fairly constant with time. The mean observed g-value of forty samples was 2.097±0.017 (S.D.). The most likely origin of these signals seemed to be iron, naturally occurring in airborne dust, and the relationship between the intensity of the resonance signal and the iron content was investigated further.
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References
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Schrader, R., and Büttner, G., Z. Anorg. Allgem. Chem., 320, 220 (1963).
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STRACKEE, L. Electron Spin Resonance of Ferromagnetic Particles in Airborne Dust. Nature 218, 497–498 (1968). https://doi.org/10.1038/218497a0
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DOI: https://doi.org/10.1038/218497a0
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