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 language||English (US)|
|Number of pages||5|
|Journal||The Journal of Chemical Physics|
|Publication status||Published - Dec 1 1992|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry