Initial growth of the water layer on (1 × 1)-oxygen-covered Ru(0001) in comparison with that on bare Ru(0001)

Michel Malick Thiam, Takahiro Kondo, Noriko Horimoto, Hiroyuki S. Kato, Maki Kawai

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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).

Original languageEnglish
Pages (from-to)16024-16029
Number of pages6
JournalJournal of Physical Chemistry B
Volume109
Issue number33
DOIs
Publication statusPublished - 2005 Aug 25

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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