Electron range studies in solid hydrocarbon films at 77 K

摘要

Low energy (E2 eV) photoelectron transmission data have been obtained for thin hydrocarbon films at 77deg;K as a function of film thickness, which has been varied in steps of 10ndash;70 Aring;. The photocurrent data approximate exponential attenuation which yield low energy range values which vary from 7 (nhyphen;nonane) to 82 Aring; (neopentane) for very thin films (t100 Aring;) and 30 (nhyphen;hexane) to 138 Aring; (neopentane) for thicker films. The origin and interpretation of the exponential distribution as well as the Gaussian distribution which is usually employed, are discussed in terms of Fermihyphen;Age and diffusion models. Two scattering models are discussed as a means of interpreting the two diffusion lengths and the apparentradic;2factor between them.