Features in the electron elastic scattering cross sections of atoms Sb, Xe and Bi, Rn

Abstract For atoms having pairwise similar electronic configurations, Sb ([ Cd ]5p 3 ), Xe ([ Cd ]5p 6 ) and Bi ([ Hg ]6p 3 ), Rn ([ Hg ]6p 6 ), features in the energy dependences of integral (ICSs) and differential (DCSs) cross sections of electron elastic scattering are considered theoretically. The positions of the Ramsauer–Townsend minimum (RT) and the low-energy maxima in the ICSs are calculated. The minima in the DCSs have been studied within the collision energy range from 0.1 ( Sb, Xe, Bi ) and 0.5 ( Rn ) eV up to 1000 ( Sb ), 2000 ( Xe ), 3000 ( Bi ) and 4000 ( Rn ) eV. The phase shifts, scattering amplitudes and cross sections have been calculated in the relativistic complex optical potential (OP) approximation. The results of the above OP calculation agree well with the experimental and the theoretical data. The energy dependences of the angular positions of the DCSs minima of these atoms are considered in detail. The energy and the angular positions of 15 ( Sb ), 17 ( Xe and Bi ) and 18 ( Rn ) critical minima (CM) in the DCSs have been found. The highest energy CM are located at: Sb – [727.6 eV; 131.89°], Xe – [791.4 eV; 133.16°], Bi – [1810.8 eV; 137.34°], Rn – [1918.8 eV; 137.64°]. A high-angle CM are located at: Sb – [233.6 eV; 151.08°], Xe – [256.5 eV; 151.05°], Bi – [180.3 eV; 157.30°], Rn – [204.0 eV; 155.36°].