Measurement of Electron Impact Ionisation and Attachment Coefficients in NO2/He Gas Mixtures and Estimated Electron Collision Cross Sections for NO2

Abstract

The electron impact ionisation a/po and attachment coefficients r]/po in N02/He gas mixtures, where po is the gas pressure at O�C, are measured by a steady-state Townsend method over a wide range of compositions and E/po values. Based on the experimental values of a/po and r]/ po, a preliminary set of the cross sections for N02 is estimated by a Boltzmann equation analysis and values of the cross sections are discussed.