Transport Characteristics of Electron Swarm in Model Ramsauer Gases under Electric Field

Energy distribution and transport coefficients of an electron swarm in model Ramsauer gases under an electric field are calculated using a new procedure “Flight time integral” (FTI) method. Electron energy distributions and transport related quantities change remarkably depending on the shapes of the Ramsauer valley and of the excitation cross section, but the changes are well understood from the electron flight behaviour around the valley. Electron transport property mainly depends on the width of the Ramsauer valley but not on the depth. It is made apparent that the well known formulae for transport coefficients sometimes give erroneous values since these formulae are written by instantaneous probabilities for the transport.