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High resolution electron energy loss spectroscopic data for the high coverage (q≳0.5) phase of CO on a Pt(111) surface show that adsoprtion occurs without any detectable changes to the characteristic vibrational modes of the admolecule. This is seen as evidence that a uniaxial compression of the admolecules does not occur, but that instead the coverage increase is accomodated by introducing coherently spaced packing faults into tje half-monolayer c(4×2) structure.
Neil R. Avery (Wed,) studied this question.