Electronic transitions at the surface of KI microcrystals. Part 1.—Surface states
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 76, 420-430
- https://doi.org/10.1039/f29807600420
Abstract
Ultraviolet spectra of sublimated KI films have been taken at room temperature by the diffuse reflectance technique. Besides contributions from the bulk, a broad band centred about 237 nm has been observed, due to surface electronic transitions of an excitonic nature. Annealing treatments and vapour adsorption [H2O, CH3OH, (C2H5)2O] show the presence of three overlapping components, related to 5-, 4- and 3-coordinate surface ions. The energies of transition are discussed in terms of the Levine and Mark electrostatic treatment. The component at highest energy is satisfactorily accounted for by the excitation at the {100} faces, whose occurrence in the samples is documented by electron micrographs. The components at lower energies are tentatively assigned to cube edges and vertexes. A brief discussion of the bands formed upon vapour adsorption is also given.Keywords
This publication has 0 references indexed in Scilit: