Alkali-metal to substrate charge transfer in TiO2(100)c(2×2)K

K. Prabhakaran*, D. Purdie, R. Casanova, C. A. Muryn, P. J. Hardman, P. L. Wincott, G. Thornton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Resonance photoemission and surface-extended x-ray-absorption fine structure (SEXAFS) have been used to investigate the electron-donor properties of potassium adsorbed on rutile TiO2(100). Potassium K-edge SEXAFS from TiO2(100)c(2×2)K shows that K lies in a bridge site, bonding to two oxygen atoms with a K-O bond distance of 2.62±0.03. Resonance photoemission data indicate that K adsorption is accompanied by charge transfer into Ti 3d band-gap states which are polaronic in nature. At 0.25 and 0.75 monolayer coverage about 1/4 of an electron is tranferred into Ti 3d states for each adsorbed potassium atom.

Original languageEnglish
Pages (from-to)6969-6972
Number of pages4
JournalPhysical Review B
Volume45
Issue number12
DOIs
Publication statusPublished - 1992

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