Stable and metastable phases of water adsorbed on Cu(111)

Barbara Hinch, L. H. Dubois

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Abstract

Metastable and stable phases of water adsorbed at low coverages on Cu (111) were studied using vibrational spectroscopy (both time-resolved and high-resolution electron energy-loss spectroscopies) and temperature programmed desorption. The two water species have distinct spectroscopic signatures and different desorption kinetics. The more stable species appears to be three-dimensional clusters of bulklike, polycrystalline ice while the metastable species was observed to have a higher desorption rate despite a larger activation enthalpy for desorption. A simple model is proposed to explain this intriguing result. The conversion from the metastable to the stable species, as well as the affects of preadsorbed carbon monoxide on the adsorption/desorption kinetics, are also discussed.

Original languageEnglish (US)
Pages (from-to)3262-3266
Number of pages5
JournalThe Journal of Chemical Physics
Volume96
Issue number4
Publication statusPublished - Dec 1 1992

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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