ABOUT SYSTEMATIC STUDYING OF CHEMICAL-SHIFTS IN X-RAY-EMISSION LINES WITH THE USE OF SYNCHROTRON-RADIATION

A physical basis is given for the advisability to study chemical shifts in X-ray emission lines with the use of synchrotron radiation. X-ray emission lines investigation is a comparatively old method but its former application was essentially restricted by the low intensities of traditional X-ray sources. This results in a low resolution. The application of SR to excite X-ray fluorescence makes it possible to hope for a drastic increase in the accuracy of measurements of line positions, considerably higher resolution, lower background, decrease in the probe mass, and shortening of measurement time. A. systematic investigation of chemical combinations will be possible from Ca (Z = 20) practically to the end of the periodic table. The method of identification of a chemical combination can be worked out using the sum of a total of 8-10 emission line shifts. Some theoretical aspects of emission line chemical shifts are presented. The factors determining the chemical shift value are the following: atom valence, combination spatial configuration, and ligand ''size''. A series of chemical combinations is proposed for systematic experimental investigations and theoretical calculations.