Experimental and theoretical investigation of the rocking curves measured for MoK α X-ray characteristic lines in the double-crystal nondispersive scheme

Abstract

The rocking curves (RCs) for MoKα1 и MoKα2 characteristic X-ray lines have been experimentally and theoretically studied in the nondispersive scheme of an X-ray double-crystal TPC-K diffractometer. The results of measurements and theoretical calculations of double-crystal RCs for characteristic X-rays from tubes with a molybdenum anode and different widths of slits show that a decrease in the slit width leads to an increase in the relative contribution of the MoKα2-line RC in comparison with the intensity of the tails of the MoKα1-line RC. It is shown that the second peak of the MoKα2 line becomes increasingly pronounced in the tail of the MoKα1-line RC with a decrease in the slit width. Two plane-parallel Si plates (input faces {110}, diffraction vector h 〈220〉) were used as a monochromator crystal and a sample. The results of measuring double-crystal RCs are in good agreement with theoretical calculations.