SPLITTING OF THE 1S(-1)3P RESONANCE IN SULFUR K XANES BY SURROUNDINGSIN COMPOUNDS WITH SULFUR-CARBON DOUBLE-BOND

Results of the experimental and theoretical investigation of X-ray abs orption S K near-edge structure in complex compounds containing a sulf ur-carbon double bond mostly in the thioureato group are presented. In the framework ofa quasi-atomic model the splitting of the 1s(-1)3p re sonance of the sulfur atom has been found to dominate the S K XANES. T he splitting of this resonance into three (one pi and two sigma*) com ponents allows to explain the main features in the spectral density of oscillator strengths of transitions from the S K-shell. To describe t he splitting both the resonance effects inside the S=CN2 group and the influence of atoms located in opposition to the sulfur atom have to b e taken into account. Applying the quasi-atomic approximation the vari ation of the partial charge on the sulfur atom in the compounds is ana lyzed.