Anomalies in surface kinetics caused by isotope dependent compression and phonon stiffening of molecular hydrogen monolayers on a transition metal surface

Wolfgang Frieß, Hartmut Schlichting, Dietrich Menzel

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We have investigated the layerwise growth and the coverage-dependent sticking coefficients of H2 and D2 on the (1×1)H/Ru(001) surface at ∼5 K by precise thermal desorption spectrometry. Strong compression of the first layer compared to the higher ones (by 22% for H2, 12% for D2) is observed. Desorption energies and sticking coefficients drop precipitously in the compression range. We explain all these effects by the large, mass-dependent zero-point widths of these molecules in the layers, with consequent high compressibilities and stiffening-induced decrease of collisional energy transfer.

Original languageEnglish
Pages (from-to)1147-1150
Number of pages4
JournalPhysical Review Letters
Volume74
Issue number7
DOIs
StatePublished - 1995

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