L-SHELL COSTER-KRONIG TRANSITION-PROBABILITIES IN NI, CU, AND MO MEASURED WITH SYNCHROTRON RADIATION

A recent technique, based on differential subshell ionization by tuned synchrotron radiation, has been applied to measurements of L-subshell Coster-Kronig yields of Ni, Cu, and Mo from L2 and L3 Auger spectra. Results for Ni are f23 = 0.6 + 0.2, f12 = 0.4 + 0.2, and f13 = 0.5 + 0.2; for Cu, f23 = 0.8 + 0.1, f12 = 0.44 + 0.06, and f13 = 0.3 + 0.2; for Mo, f23 = 0.15 + 0.02, f12 = 0.15 + 0.02, and f13 = 0.61 + 0.06. Measured transition probabilities are compared with previously available information. The results are generally consistent with the body of theoretical and experimental data. For Ni and Cu, the present measurements of f23 confirm that the L2-L3M4,5 Coster-Kronig channel is accessible in the metals, even though it is energetically cut off in free atoms. Further improvements in synchrotron-radiation sources are likely to make it possible to throw light on several critical questions by means of the present method.