Scattering of X‐rays near the K absorption edge I. Fluorescence and resonant Raman scattering in transition metals

Formulas for the resonant cross section of X‐rays are rederived emphasizing the similarity of the resonant Raman scattering (RRS) to the fluorescence, and are given in terms of the oscillator strengths and radiative widths. In both processes only a fraction results in radiation, and for the RRS this is termed the RRS yield, wRRS, in analogy with the fluorescence yield, wK. Measurements are made in the symmetrical reflection geometry from totally absorbing samples. The fluorescence yield is measured CuKα as exciting radiation for Ti, V, Cr, Mn, and Fe, the results being 0.237, 0.265, 0.291, 0.325, 0.356, respectively. The absolute cross section of the (1s, 2p) contribution to the RRS is measured for Cr, Mn, Fe, Ni, and Cu at energies 42 to 940 eV below the K absorption edge. The RRS yields are 0.404, 0.426, 0.422, 0.415 (0.460 in another measurement), and 0.473 (0.468), respectively. Also evidence is found for the existence of the (1s, 3p) contribution to the RRS.