Eur. Phys. J. D 33, 213-220 (2005)
https://doi.org/10.1140/epjd/e2005-00039-3

Excitation-autoionization cross-sections and rate coefficients for Ge-like ions

¹ Jerusalem College of Engineering, Ramat Beth Hakerem, 91035 Jerusalem, Israel
² Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel
³ Nuclear Research Center-Negev, P.O. Box 9001, 84190 Beer Sheva, Israel

Corresponding author: ^a pinchasm@jce.ac.il

Received: 7 December 2004
Published online: 12 April 2005

Abstract

Results of cross-section and rate coefficient calculations for electron impact direct and indirect ionization of ions belonging to the GeI isoelectronic sequence (ground ) are presented. The cross-sections are given at near threshold energies for the five ions Kr⁴⁺, Mo¹⁰⁺, Xe²²⁺, Pr²⁷⁺ and Dy³⁴⁺. The rate coefficients are computed for all the ions from Kr⁴⁺ to U⁶⁰⁺ in the GeI sequence at seven electron temperatures ( and , where E_I is the first ionization energy). The calculations include the contribution of direct ionization ({DI}) calculated with the Lotz formula approximation and the contributions of excitation-autoionization (EA) calculated in the framework of the distorted wave (DW) approximation for the , and resonant inner-shell excitations. The ionization enhancement due to the EA channels is shown as a function of Z along the GeI isoelectronic sequence.