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Orientational Ordering on a Corrugated Substrate: Novel Pinwheel Structure for Adsorbed on Cu(110)
Phys. Rev. Lett. 78, 1504 – Published 24 February, 1997
DOI: https://doi.org/10.1103/PhysRevLett.78.1504
Abstract
The structure and orientational ordering of molecules adsorbed on the Cu(110) surface is investigated in a combined experimental and theoretical study. Using He atom diffraction we find that monolayer forms a high-order commensurate phase with an oblique unit cell. Minimum energy calculations based on realistic potentials show that the unit cell contains seven molecules arranged in a novel type of pinwheel structure unexpected for linear molecules adsorbed on a smooth surface. Molecular dynamics simulations corroborate this structure and its remarkable thermal stability.
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