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 language | English |
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Pages (from-to) | 6969-6972 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 45 |
Issue number | 12 |
DOIs | |
Publication status | Published - 1992 |