Resonances in electron scattering by atoms and ions

Abstract

Vacuum spacetimes endowed with two commuting spacelike Killing vector fields are considered. Subject to the hypothesis that there exists a shearfree null geodesic congruence orthogonal to the two-surface generated by the two commuting spacelike Killing vector Gelds, it is shown that, with a specific choice of null tetrad, the Newman-Penrose equations are reduced to an ordinary differential equation of Riccati type. From the consideration of this differential equation, exact solutions of the vacuum Einstein field equations with distribution valued Weyl curvature describing the propagation of gravitational impulsive and shock wave of variable polarization are then constructed. PACS numbers: 04.70

Model Potential Calculations for Various Electronic Excited States of Li- and Na-

“…and six 1 P states have been located below the Li(3 p ) and Li(4 p ) thresholds. , In the case of Na - , four 1 P excited states lying below the Na(4 d ) threshold have been identified . Several excited electronic states determined experimentally by Kazakov and Lengyel and reported in ref have been also quoted in Table . In the experimental energy range, computed energies appear either lower or higher for the two negative ions.…”