The first layer of water on Rh(111): Microscopic structure and desorption kinetics

Atsushi Beniya, Susumu Yamamoto, Kozo Mukai, Yoshiyuki Yamashita, Jun Yoshinobu

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The adsorption states and growth process of the first water (D 2O) layer on Rh(111) were investigated using infrared reflection absorption spectroscopy, temperature programed desorption, and spot-profile-analysis low energy electron diffraction. Water molecules wet the Rh(111) surface intact. At the early stage of first layer growth, a (√3 × √3)R30ο commensurate water layer grows where "up" and "down" species coexist; the up and down species represent water molecules which have free OD, pointing to a vacuum and the substrate, respectively. The up domain was a flatter structure than an icelike bilayer. Water desorption from Rh(111) was a half-order process. The activation energy and the preexponential factor of desorption are estimated to be 60 kJ/ mol and 4.8 × 10 16 ML 1/2/s at submonolayer coverage, respectively. With an increase in water coverage, the flat up domain becomes a zigzag layer, like an ice bilayer. At the saturation coverage, the amount of down species is 1.3 times larger than that of the up species. In addition, the activation energy and the preexponential factor of desorption decrease to 51 kJ/mol and 1.3 × 10 14 ML 1/2/s, respectively.

Original languageEnglish
Article number054717
JournalJournal of Chemical Physics
Volume125
Issue number5
DOIs
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'The first layer of water on Rh(111): Microscopic structure and desorption kinetics'. Together they form a unique fingerprint.

Cite this