Experimental study of the widths and shapes of the K x-ray doublet from Ca (20) to Ni (28)

Abstract

The rocking curves of the K x-ray doublet of elements Ca (20) to Ni (28) have been recorded with a vacuum double-crystal spectrometer, and measurements of the full widths at half maximum intensity, relative intensities, asymmetry and degree of resolution have been made. Resolution of the observed overlapping curves into the two component lines 1 and 2 has been attempted. The relative intensity of the doublet lines 1 to 2, if defined in terms of the double-crystal spectrometer as the ratio of areas under the component curves, is 2 to 1 for all elements studied within an estimated error of 2 percent. The asymmetry of the lines is found to increase from Ca to Fe, then to decrease with increasing atomic number. The values of the full widths, uncorrected for divergence and for the finite resolving power of the crystals, of the component lines, in X.U., follow: Ca Ti Va Cr Mn Fe Ni K1 1.60 1.22 1.15 1.08 1.10 1.02 0.72 K2 1.54 1.43 1.35 1.30 1.22 1.12 0.88 The ratio of peak intensities is observed to vary from element to element in such a way as to compensate for the variations in line widths so that the ratio of component areas remains constant. © 1933 The American Physical Society.