Total Ionization Cross Sections

Abstract

The measurement of the total ionization cross section, σt for a gaseous sample requires the determination of four quantities. They are the current ie (T) of a beam of electrons having incident energy T, the total ion current it (T)produced by the electron beam, the number density ρ of atoms or molecules in the gas, and the collision pathlength L over which the produced ions are collected. Then, σt may be obtained from the relation 7-1% MathType!MTEF!2!1!+-% feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyAamaaBa% aaleaacaWGPbaabeaakiaacIcacaWGubGaaiykaiaac+cacaWGPbWa% aSbaaSqaaiaadwgaaeqaaOGaaiikaiaadsfacaGGPaGaeyypa0Jaeq% yWdiNaamitaiabeo8aZnaaBaaaleaacaWG0baabeaakiaacIcacaWG% ubGaaiykaiaac6caaaa!4898!]]