Generalized oscillator strength and inelastic cross sections for the Xe 4d resonances

Electron energy-loss spectra for the Xe atom were measured for a given set of scattering angles (1.5degrees-20.0degrees), in an energy-loss range from 40 to 180 eV using an incident electron energy of 1045 eV and an energy resolution of 1.0 eV The absolute generalized oscillator strength (GOS) and cross section have been determined for the intense shape resonance (4d --> epsilonf) and for the discrete resonance 4d(S-1(0)) --> 6p(D-2(5/2)) in the Xe atom. The GOS curve as a function of the, square of the momentum transfer for the shape resonance, presents a well-defined minimum. In order to obtain the optical oscillator strength for our data normalization, the electron energy-loss spectrum (1.5) was converted to a photoabsorption spectrum. A broad band has also been observed in the energy-loss spectra, centred at 80.0 eV According to previous analysis, it has been assigned to double excitations (4d(-1)5p(-1)).