Abstract
Low-energy electron diffraction (LEED) observations of molecular oxygen physisorbed on graphite are reported. The structure of the low-coverage phase is shown to be a centered parallelogram and the rotational epitaxy is determined. At temperatures above 22 K where the LEED study was carried out, we find that the rotational epitaxy changes with coverage (the layer exhibits a Novaco-McTague effect). The possibilities of the structure melting anisotropically and of a low-temperature commensurate phase are discussed. Defect-stabilized or metastable structures are also observed.
- Received 31 January 1983
DOI:https://doi.org/10.1103/PhysRevB.27.6413
©1983 American Physical Society