SEXAFS and NIXSW investigation of the Rh(111)-(root 7 x root 7)R19.1 degrees-P surface

P K-edge surface extended X-ray absorption fine structure (SEXAFS) of the R h(111)-(root 7x root 7)R19.1 degrees-P surface is reported. The results ind icate that a recently proposed model for this surface is valid in which a m ixed overlayer of composition Rh5P3 is formed on the Rh(111) surface. Howev er, some modifications to atomic positions are necessary to acheive consist ency with the Rh-P bond lengths determined by SEXAFS; this leads to a reapp raisal of our normal incidence X-ray standing wavefield (NIXSW) data from t he same surface. (C) 1999 Elsevier Science B.V. All rights reserved.