Distorted Wave Method Applied to Electron Impact Excitation of the Lowest Autoionizing State of Rubidium
Omboga, Oketch Fredrick
MetadataShow full item record
The study of electron-atom collisions has several useful applications in high density gas discharges, laboratory and astrophysical plasmas and gas lasers. Knowledge of electron scatteringfrom atoms and molecules is also important for the development of theoretical models for quantitative analysis of Auger-electron spectroscopy, X-ray photoelectron spectroscopy, electronmicroprobe analysis and analytical electron microscopy. In this study, integral crosssection, differential cross-sections, alignment and lambda parameters for electron impact excitationof first auto ionizing state of Rubidium have been calculated using distorted-wave method.A linear combination of static potentials of initial and final target states has been applied asthe final channel distortion potential and the static potential of the initial target state used as theinitialchannel distortion potential. The wave functions used in this model are the multi-zeta andthe double-zeta Hartree-Fock single electron wave functions due to Clementi and Roetti. Numericalcalculations were performed using a DWBAI program, which was modified to evaluatethe exchange amplitudes exactly without any approximation. The present results have been compared with other known theoretical and experimental results. From the present calculationsit is observed that at impact energy near threshold there is an abrupt increase in the integralcross sections and in the present alignment parameter results, a near threshold resonant structurewas observed.