Measurement of the cross section for electron impact ionization of multi-electron ions. II. N²⁺to N³⁺and C⁺to C²⁺

Abstract

For pt. I, see ibid., vol. 4, 1176, 1971. Absolute measurements have been made of the electron impact ionization cross sections for the reaction N2++e to N3++2e and its isoelectronic partner C++e to C2++2e. The technique of crossed beams was employed. Measurements were extended to energies below threshold and the presence of metastable ions observed; their influence upon the measured cross sections is discussed. The present experimental data is compared with Coulomb-Born calculations by Moores, classical binary encounter calculations by Thomas and Garcia, and a semiempirical estimate by Lotz.