The far-infrared absorption spectrum of crystalline alpha oxygen (α-O₂) has been measured in annealed samples up to 20 mm thick. The prominent feature of the spectrum is a temperature-dependent absorption near 27 cm^-1 which appears to be an anti-ferromagnetic resonance mode, the first such collective excitation to be observed in a molecular solid.
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Blocker et al. (1969) studied this question.
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