OSCILLATOR-STRENGTH PARAMETERIZATION OF INNER-SHELL CROSS-SECTIONS

We present a compilation of dipole oscillator strengths f(DELTA) for ionization of K, L, M, N and O atomic shells, integrated over an energy range DELTA (typically 100 eV) above the ionization threshold. The information was derived from Hartree-Slater calculations, photoabsorption data and measurements by electron energy-loss spectroscopy (EELS). In the case of M-, N- and O-edges, experimental values considerably exceed the Hartree-Slater predictions. From an assessment of the data, we suggest values of f(DELTA) for use in elemental analysis by EELS in the transmission electron microscope.