KL EDGES IN X-RAY-ABSORPTION SPECTRA OF 3RD-PERIOD ATOMS - SI, P, S, AND CL

A systematic investigation of double-electron KL-edge resonances in x- ray-absorption spectra of third-period atoms (Si, P, S, and Cl) is pre sented. Experimental data on NaH2PO4, Graham's salts (Na2O:P2O5), Na4P 2O7, elemental S, Na2SO3, K2SO4, CuSO4, Na2S2O3, Na2S2O6, NaClO2, NaCl O3, and NH4ClO4 are reported and discussed in combination with previou s measurements at the Si KL edge of SiX4, (X = H, CH3, Br, Cl, F) mole cules. The further comparison of these results with KL-edge structures in Ne and Ar provides an almost complete overview of these excitation s for third-period atoms. A compilation of energies and oscillator str engths for the dominant resonances is reported and the main trends of energy splitting, intensity, and energy position versus oxidation stat e and Z number are discussed.