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Initial stages of square lattice stacks of CH /MgO(001)

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1098-0121, Vol: 85, Issue: 3
2012
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Calculations of monolayer and bilayer lattices of methane on MgO(001) are reported for a spherical model of the molecule. The observed stability of c(2×2) [also termed (√2×√2)R45 ] commensurate square monolayer and bilayer lattices is reproduced with a surface energy corrugation that implies a large gap in the monolayer phonon density of states of the commensurate CH . This gap is present in the incoherent inelastic neutron scattering measurements reported here. © 2012 American Physical Society.

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