Absolute and effective cross-sections for low-energy electron-scattering processes within condensed matter.
Within the last two decades, a number of experimental techniques have been developed to measure mean free paths and absolute and effective cross-sections for various processes related to the interaction of low-energy electrons with condensed matter. In all of the experiments, a monochromatic electron beam impinges on a thin multilayer film composed of atoms and/or molecules condensed on a metal or semiconductor substrate held at cryogenic temperatures in an ultra-high-vacuum system. Depending on the apparatus, cross-sections are obtained from low-energy electron transmission (LEET), high-resolution electron energy loss (HREEL), x-ray photoelectron (XPS) spectroscopy, electron-stimulated desorption (ESD) of neutral and ions, or a combination of these techniques. Quasi-elastic and inelastic mean free paths have been extracted from LEET data. This method has also served to generate absolute cross-sections for electron trapping and fragment production from the dissociation of transient molecular anions. In amorphous ice, a complete set of absolute cross-sections for all inelastic losses by 1-20 eV electrons has been obtained from HREEL data. Effective cross-sections for neutral and ionic radical formation were generated by desorption and XPS experiments. These various methods are briefly described in this article, and the corresponding cross-sections in the range 0-20 eV summarized.
Groupe CRM en Science des Radiations, Faculté de Médecine, Université de Sherbrooke, Quebec, Canada.
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D001128:Argon / Q000737:chemistry; D001703:Biophysics / Q000379:methods*; D003562:Cytidine / Q000737:chemistry; D004583:Electrons; D004735:Energy Transfer; D006859:Hydrogen / Q000737:chemistry; D007726:Krypton / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods; D013223:Statistics as Topic; D013936:Thymidine / Q000737:chemistry; D014978:Xenon / Q000737:chemistry
D014978:Xenon; D003562:Cytidine; D007726:Krypton; D001128:Argon; D006859:Hydrogen; D008697:Methane; D010100:Oxygen; D013936:Thymidine; D012825:Silicon