KLedges in x-ray-absorption spectra of third-period atoms: Si, P, S, and Cl

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A systematic investigation of double-electron KL-edge resonances in x-ray-absorption spectra of third-period atoms (Si, P, S, and Cl) is presented. Experimental data on NaH₂{PO}₄$, Graham's salts (${Na}₂$O:${P}₂O₅), Na₄{P}₂O₇, elemental S, Na₂{SO}₃$, ${K}₂SO₄, CuSO₄, Na₂{S}₂O₃, Na₂{S}₂O₆, NaClO₂, NaClO₃, and NH₄{ClO}₄$ are reported and discussed in combination with previous measurements at the Si KL edge of Si${X}₄$, (X=H,${CH}₃$,Br,Cl,F) molecules. The further comparison of these results with KL-edge structures in Ne and Ar provides an almost complete overview of these excitations for third-period atoms. A compilation of energies and oscillator strengths for the dominant resonances is reported and the main trends of energy splitting, intensity, and energy position versus oxidation state and Z number are discussed.