Phosphorus K shell photoabsorption spectra of the oxides P4O6, P4O10, P(C6H5O)3 and PO(C6H5O)3

Abstract XANES and EXAFS spectra of P 4 O 6 , P 4 O 10 , triphenylphosphite and triphenylphosphate have been obtained at the phosphorus K edge using synchrotron radiation from the Bonn 2.5 GeV synchrotron. In order to point out the effects of symmetry distortion and the influence of next neighbour atoms, the term values and linewidths of the pre-edge resonances are compared with the results in multiple scattering (MS)-Xα calculations of (PO 3 ) 3− and (PO 4 ) 3− clusters, which are assumed to comprise all the interactions which are of relevance for the complete molecules. A correlation between the bond lengths and the term values of the shape resonances can be extracted from the experimental data.