Characteristics of a Long Ionization Chamber, and Anomalous Responses near the Guard Tube

Abstract

Low-temperature electron-impurity scattering times have been measured in ntype InSb samples with different electron densities from Faraday rotation by using a pulsed 0.337 mm HCN laser. The electron-impurity scattering times obtained from the experimental results using a curve-fitting method yielded values of 3 to 4 X S at liquid helium temperatures for three different samples. These scattering times were in sharp contrast to the field dependent DC scattering times calculated from DC mobility measurements at 4.2 K in zero magnetic field. However, there was good agreement between the impurity scatterink times observed from the Faraday rotation measurements and those derived from the cyclotron resonance linewidth measurements at 4.2 K. Possible explanations of the experimental results were also considered.