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In a comprehensive x-ray scattering and heat-capacity study of O₂ physisorbed onto basal planes of graphite, at least four independent solid phases are found, whose characters differ markedly from previous descriptions. The most important change is for the monolayer δ phase, which is believed to consist of a rectangular lattice with the molecules lying down on the graphite surface. The precise nature of several of the higher coverage phases remains unknown.
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Stephens et al. (1980) studied this question.
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