Regular Mixing in a Two-Dimensional Lattice System: The Coadsorption of N and O on Ru(0001)
- 19 October 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 81 (16), 3483-3486
- https://doi.org/10.1103/physrevlett.81.3483
Abstract
The coadsorption of N and O on Ru(0001) has been studied by scanning tunneling microscopy; by this technique we can distinquish between the two atomic adsorbates. N and O form a dense intermixed phase in equilibrium with a dilute lattice gas. The two-dimensional “vapor pressure” of N, i.e., its concentration in the lattice gas, has been determined for various ratios of N and O in the dense phase by adjusting the total coverage of N and O. The resulting vapor pressure curve indicates a positive enthalpy of mixing, due to relatively weak N-O interactions in the dense phase.
Keywords
This publication has 9 references indexed in Scilit:
- Real-time STM observations of atomic equilibrium fluctuations in an adsorbate system: O/Ru(0001)Surface Science, 1997
- Adsorbate-adsorbate interactions from statistical analysis of STM images: N/Ru(0001)Physical Review B, 1996
- Identification of the "Active Sites" of a Surface-Catalyzed ReactionScience, 1996
- Diffusion and Atomic Hopping of N Atoms on Ru(0001) Studied by Scanning Tunneling MicroscopyPhysical Review Letters, 1996
- Interaction of oxygen with Al(111) studied by scanning tunneling microscopyThe Journal of Chemical Physics, 1993
- Critical behavior of p(2×2) oxygen on Ru(001): An example of four-state Potts critical exponentsPhysical Review B, 1989
- High resolution electron energy loss investigations of the adsorption of NO on the clean and oxygen precovered Ru(001) surfaceSurface Science, 1984
- A multimethod study of the adsorption of NO on Ru(001): I. XPS, UPS and XAES measurementsSurface Science, 1979
- Adsorption and Dissociation of Nitric Oxide on the Ru(001) SurfacePhysical Review Letters, 1978