[en] A resonance-like feature has been observed in the excitation function of the 5p⁵6s²²Psub(3/2) autoionising state of caesium, excited by electron impact. The excitation function was obtained by measuring the intensity of ejected electrons at 75⁰ to the incident electron beam. In addition, excitation functions for two non-optical autoionising transitions are presented. These results are discussed in the context of available theoretical and experimental data. (author)

No abstract available

[en] Experimental results of total electron attachment cross sections are presented with, for comparison, two additional sets of data, those of Orient and Srivastava and of Spyrou et al.. Both were normalized to present values of the first attachment peak at 4,6 eV, in order to show more clearly differences in cross section curve shapes. In fact, data of Orient and Srivastava are larger that the present ones for a factor of 2,82; while those of Spyrou et al. are higher only for 3,70 %. Both these sets of data, as well as those by Cadez et al., cover an incident electron energy range 3,40 - 9,40 eV. Electron attachment processes at energies higher that 9,40 eV have been in fact detected and measured in the same set of experiments that led to former publication of lower energy attachment processes by Cadez et al.. At that time in none of experiments, that could distinguished ionic species formed in dissociation attachment processes, was a sign of ions at incident electron energies exceeding 9,40 eV. That caused our ignorance toward processes detected and measured at higher incident electron energies, mainly since they were at least one order of magnitude lower that the two peaks at 4,6 eV and 7,3 eV, respectively. Without additional experiments, that include mass analysis of ionic species formed in dissociative electron attachment processes, it is not possible to give any sound explanation to causes of peaks at energies higher that 8,0 eV

No abstract available

No abstract available

[en] Relative differential electron impact cross sections (σ(θ)) for elastic and inelastic (3p, 4s, 3d, 4p) scattering at 10 eV, 20 eV (3p and 4s excitation only) and 54.4 eV by sodium atom have been measured. The σ(θ) for the 3s-3p transition are normalized to the optical oscillator strength. The angular range of measurements is from 2^o for inelastic and from 6^o for elastic scattering, up to 150^o for both. Results are compared with the available experimental and theoretical data. (author)

[en] Normalized, absolute differential cross sections (DCS's) have been measured for the 20 lowest electronic states of xenon. Incident electron energies were 15, 20, 30, and 80 eV and the scattering angles ranged from 5⁰ to 150⁰. The energy resolution was 40 meV. Absolute elastic DCS's have been obtained by normalizing the relative values to the recently published absolute elastic DCS's by Register et al. [J. Phys. B 19, 1685 (1986)]. Elastic-to-inelastic intensity ratios, at different incident energies for the 6s[(3/2]₁ state were determined. These ratios were utilized as secondary standards to establish the absolute scale for the other inelastic processes in accordance with intensity ratios of lines in energy-loss spectra. The absolute inelastic DCS's were extrapolated to 0⁰ and 180⁰ and integrated to yield the integral cross sections (ICS's). A comparison of the present DCS's with the only available measurements at 20 eV impact energy shows satisfactory agreement in shape but considerable difference in absolute value

[en] Autoionizing and Auger transitions in atomic manganese and samarium have been experimentally investigated by observation of the ejected electrons in the energy region 0 to 40 eV following electron impact excitation with incident beams in the energy range 15-500 eV. Seventy-four spectral features are tabulated for manganese and a number of new assignments have been made based on pseudo-relativistic Hartree-Fock calculations and quantum defect analysis. A similar study of samarium reveals only a number of broad features in the ejected-electron energy range 8-10 eV. Three features have been observed consistently in the ejected-electron spectrum of samarium and assigned by comparison with previous work. (author)

No abstract available

[en] The ejected-electron spectrum of ytterbium following excitation by electron impact has been measured in the range 0-22.5 eV; 119 spectral features have been tabulated. Excitation was studied over the range of incident electron kinetic energies 8-500 eV. Excitation functions are reported for a number of the autoionising transitions which result in ejected electrons in the range 0-3 eV. (author)