title: Coverage-dependent sticking probability and desorption kinetics of water molecules on Rh(111).
abstract: The adsorption and desorption kinetics of water molecules on Rh(111) were investigated using temperature programed desorption (TPD). Water molecules on Rh(111) show coverage-dependent sticking probability; the initial sticking probability is estimated to be 0.46. In the desorption process, a dilute gaslike phase and two-dimensional islands of water coexist on the surface. Based on the model proposed by Kreuzer and Payne [Surf. Sci.200, L433 (1988)], the apparent fractional-order TPD spectra can be interpreted as first-order desorption from the coexistence of two phases on which the sticking probabilities are different. Based on this, the previous estimation of pre-exponential factors assuming half-order desorption [A. Beniya et al., J. Chem. Phys.125, 054717 (2006)] should be revised.
authors.affiliation: The Institute for Solid State Physics, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Beniya
authors.forename: Kozo
authors.initials: K
authors.lastname: Mukai
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Yamashita
authors.forename: Jun
authors.initials: J
authors.lastname: Yoshinobu