Phys. Rev. Lett. 54, 1536–1538 (1985)Evidence of a Square Two-Dimensional Solid of Methane Physisorbed on the (100) Surface of Magnesium OxideReceived 10 September 1984; published in the issue dated 8 April 1985 The structure of CD4 films adsorbed on a highly homogeneous MgO(100) surface has been probed by neutron diffraction. Both the monolayer and the bilayer crystallize in a commensurate square c(2×2) superstructure. This is the first clear evidence of a two-dimensional condensation of a solid van der Waals film with square symmetry. An order-disorder transition is observed and appears to be a first-order melting. © 1985 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.54.1536
DOI:
10.1103/PhysRevLett.54.1536
PACS:
68.20.+t, 61.12.Dw, 68.45.Da, 82.65.Jv
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