Research on the electron attachment of oxygen using a Frisch-grid ionization chamber

Abstract The electron attachment is studied using a Frisch-grid ionization chamber (GIC) with different number densities of O2 in the working gas and different reduced electric fields. The influence of the electron attachment on the cathode–anode two-dimensional amplitude spectrum of the GIC is measured and evaluated. The method of measuring the attachment probability per unit time using the GIC is established. The quantitative and systematic relationships between the attachment probability per unit time and the number density of O2 and the reduced electric field are obtained from experiments, where the number densities of O2 are from 0 to 2.29  ×  1017 cm −3 and the reduced electric fields are from 22 to 577 V/cm/bar. The three-body attachment coefficients of O2 at different mean electron energies (