Clustered water adsorption on the NaCl(100) surface

Abstract

The adsorption dynamics of water on NaCl(100) is studied by molecular dynamics calculations as a function of coverage. We find that, starting from a critical coverage of about 1/2 monolayer, a coupling of the water dipoles sets in and the interaction between the water molecules wins over the interaction between adsorbate and substrate leading via percolation to formation of infinite cluster networks. This effect is confirmed qualitatively by surface sensitive optical second harmonic measurements with well-controlled water exposure. At a coverage of one bilayer, a two-dimensional ‘‘ice’’ structure is found to be stable. Simulated low-energy electron diffraction (LEED) patterns for this configuration are in excellent agreement with recent observation of a c(4×2) overstructure.

Ultrathin epitaxially grown bismuth (111) membranes

“…11 We never observed the water-induced NaCl ͑4 ϫ 2͒ reconstruction, that appears under electron irradiation as reported in literature. 12,13 We therefore conclude that all water was removed successfully by the propanol rinse.…”

Two Dimensional Ice Adsorbed on Mica Surface

“…This evidence comes from scanning polarization force microscopy (SPFM) measurements at finite humidity which have shown that water condenses into solidlike polygonal domains in angular epitaxial relationship with the underlying mica surface [6,7]. The stability of this phase at room temperature is rather unusual since previously reported icelike structures on metals [1] and on insulators [8,9] have been observed in ultrahigh vacuum (UHV) only at low temperatures.…”

A helium atom scattering study of water adsorption on the NaCl(100) single crystal surface

“…In the last five years several different techniques have been applied to study the adsorption of water on both monocrystalline NaCl surfaces and epitaxially grown NaCl films on a Ge͑100͒ substrate in UHV conditions. [11][12][13][14] A FTIR spectroscopy study of D 2 O adsorption on a single crystal NaCl surface provided no evidence for a 2D phase transition and the formation of an ordered adsorbed layer. 13 Two types of spectra were found, ascribed to an incomplete 2D disordered layer and to 3D ice.…”