Accession Number : ADA184342

Title :   K-CO on Transition Metals: A Local Ionic Interaction.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS

Personal Author(s) : Patterson,Charles H ; Schultz,Peter A ; Messmer,Richard P

PDF Url : ADA184342

Report Date : May 1987

Pagination or Media Count : 4

Abstract : We wish to address the nature of the K-CO interaction on a transition metal surface when the K:CO stoichiometry is approx. 1. The interaction proposed is transfer of the K 4s electron to CO. A BORN-Haber cycle for this process on a surface has been calculated. The reference state is K plus CO, bound separately to the surface (a). A key point in the cycle is that removal of the electron from K bound to a metal surface (b) is less costly in energy (approx. metal/K surface, i.e. approx. +2.0 eV) than from K in the gas phase (IP = +4.3 eV). This means that the complex is significantly stabilized on the surface. The removed K electron is then transported to the isolated adsorbed CO (c) at a cost of the electron affinity of CO (approx. =1.5 eV). When the isolated ions are brought together (d) the net stabilization at the equilibrium geometry is approx. - 1.8 eV.

Descriptors :   *POTASSIUM, *CARBON MONOXIDE, TRANSITION METALS, INTERACTIONS

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE