Ionization Cross Sections for 10-300-keV/u and Electron-Capture Cross Sections for 5- 150-keV/u ³He²⁺ Ions in Gases

Authors

M. Eugene Rudd, University of Nebraska - LincolnFollow
T. V. Goffe, University of Nebraska - Lincoln
A. Itoh, University of Nebraska - Lincoln

Date of this Version

10-1985

Comments

Published in Physical Review A Volume 32, Number 4, October 1985. Copyright © American Physical Society; used by permission.

Abstract

Cross sections for production of positive and negative charge for 10-300-keV/u He²⁺ ions on He, Ne, Ar, Kr, H₂, N₂, CO, O₂, CH₄, N₂O, and C0₂ were measured by the transverse-field method. Single- and double-electron-capture cross sections at 5-150 keV/u for the same targets were measured by the method of deflection of different charge-state components of the beam after passing through a known length of target gas. A secondary-emission detector was used to detect the neutral component of the beam. A small least-squares adjustment of the cross sections was made to satisfy the equation σ₊ =σ_- + σ₂₁ + 2σ₂₀ which follows from conservation of charge.