Excitation and ionization of outer shells in Rb by electron impact. (4th September 2015)

• Record Type: Journal Article
• Authors: Roman, V; Kupliauskienė, A; Borovik, A
• Is Part Of: Journal of physics. Volume 48:Number 20(2015:Oct. 15)
• Publication Date: 2015-09-04
• Subjects: ionization of atoms -- inner-shell excitation -- theory -- experiment; 32.80.Dz -- 34.80.Dp; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/48/20/205204
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: The relativistic distorted-wave and binary-encounter-dipole approximations were employed for calculating the electron-impact single ionization cross sections of the 5s, 4p 6, 4s 2, 3d 10 shells and 4p 6 excitation cross section for Rb atom taking into account both configuration interaction and relativistic effects. The capabilities of the most used theoretical approaches in describing the single ionization of Rb atom were considered by comparing the present and other available calculated data with the experimental total ionization and total direct single ionization cross sections over the electron-impact energy range from the 5s threshold to 600 eV. The best agreement within experimental uncertainty was obtained by using the non-relativistic binary-encounter-dipole approximation included in the LANL Atomic Physics Codes package. At present none of the used approximations (plane-wave Born or relativistic distorted wave) can satisfactorily describe the experimental excitation-autoionization cross section in rubidium because the efficient formation of the 4p 6 core-excited negative-ion rubidium states at near-threshold impact energies is ignored in calculations.