The results of a neutron-diffraction study of the melting properties of multilayer oxygen films are presented. The experiments have been carried out between 30 and 55 K on films ranging from 2 to 8 layers in thickness. A compound solid-liquid film is observed in the range 40--48 K. This composite film results from surface melting of the solid film phase which is present at 40 K. The thickness of its melted component is proportional to ln(Tₜ-T), where Tₜ is the melting temperature of bulk oxygen. The structure of its solid component is nearly identical to that of the bulk {β} phase. The data suggest that multiple wetting transitions may be present in this system.
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Chiarello et al. (1988) studied this question.
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