TY - JOUR
T1 - Initial growth of the water layer on (1 × 1)-oxygen-covered Ru(0001) in comparison with that on bare Ru(0001)
AU - Thiam, Michel Malick
AU - Kondo, Takahiro
AU - Horimoto, Noriko
AU - Kato, Hiroyuki S.
AU - Kawai, Maki
PY - 2005/8/25
Y1 - 2005/8/25
N2 - The initial growth of a water (D2O) layer on (1 × 1)-oxygen-covered Ru(0001) has been studied in comparison with that on bare Ru(0001) by means of temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). Although water molecules adsorbed on both bare and (1 × 1)-oxygen-covered Ru(0001) commonly tend to form hydrogen bonds with each other when mobility occurs upon heating, the TPD and IRAS measurements for the two surfaces exhibit distinct differences. On (1 × 1)-oxygen-covered Ru(0001), most of the D2O molecules were desorbed with a peak at 160 K, even at submonolayer coverage, as condensed water desorption. The vibration spectra of adsorbed D2O also showed broad peaks such as a condensed water phase, from the beginning of low coverage. For submonolayer coverage, in addition, we found a characteristic O-D stretching mode at around 2650 cm-1, which is never clearly observed for D 2O on bare Ru(0001). Thus, we propose a distinctive water adsorption structure on (1 × 1)-oxygen-covered Ru(0001) and discuss its influence on water layer growth in comparison with the case of D2O on bare Ru(0001).
AB - The initial growth of a water (D2O) layer on (1 × 1)-oxygen-covered Ru(0001) has been studied in comparison with that on bare Ru(0001) by means of temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). Although water molecules adsorbed on both bare and (1 × 1)-oxygen-covered Ru(0001) commonly tend to form hydrogen bonds with each other when mobility occurs upon heating, the TPD and IRAS measurements for the two surfaces exhibit distinct differences. On (1 × 1)-oxygen-covered Ru(0001), most of the D2O molecules were desorbed with a peak at 160 K, even at submonolayer coverage, as condensed water desorption. The vibration spectra of adsorbed D2O also showed broad peaks such as a condensed water phase, from the beginning of low coverage. For submonolayer coverage, in addition, we found a characteristic O-D stretching mode at around 2650 cm-1, which is never clearly observed for D 2O on bare Ru(0001). Thus, we propose a distinctive water adsorption structure on (1 × 1)-oxygen-covered Ru(0001) and discuss its influence on water layer growth in comparison with the case of D2O on bare Ru(0001).
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U2 - 10.1021/jp052167q
DO - 10.1021/jp052167q
M3 - Article
C2 - 16853034
AN - SCOPUS:24944450286
VL - 109
SP - 16024
EP - 16029
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 33
ER -