Intensity Distributions of the K Emission Spectra of Iron

A curved crystal spectrometry is applied for the study of the electron excited (30 kV) FeK emission spectra. No fine structure is directly seen in the α 1 , 2 and β 1 , 3 lines, but the lines are strongly asymmetric. The asymmetry is due to relatively strong low energy satellites, probably caused by the radiative Auger effects K → LV, K Deutsche Forschungsgemeinschaft MV, in addition to interactions between the final state hole and the unfilled 3d level for β 1 , 3 ; and to unresolved splittings of the L III and L II levels for α 1 and α 2 . Weak high energy satellites are also present for the same lines and most likely due to a spectator vacancy in the M level and/or in the valence band V. The Kβ 5 band is corrected for background, continuous radiation, self‐absorption, and overlap with β 1 , 3 . The intensity maximum of Kβ 5 is (2.56 ± 0.1) eV below the Fermi energy. The FWHM value for α 1 is (2.60 ± 0.05), for α 2 (3.02 ± 0.05), for β 1 , 3 (4.04 ± 0.05), and for β 2,5 (5.56 ± 0.05) eV. The index of asymmetry for α 1 is (1.57 ± 0.05), for α 2 (1.26 ± 0.05), and for β 1 , 3 (1.77 ± 0.05). The spin—Orbit splitting between the 3p 3/2 and the 3p 1/2 levels obtained from the Lorentzian fit for β 1 , 3 is (1.22 ± 0.05) eV, whereas Hartree‐Fock calculations give 1.58 eV.