Electron attenuation lengths in alkali halides

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Abstract
The attenuation length for electrons in NaCl has been determined to vary from 17 Å at 76 eV to 47 Å at 1403 eV and the equivalent range in NaF found to be from 12 to 50 Å by means of a photoelectron spectroscopic overlayer technique. A semiempirical theory based on a tight-binding model has been shown to give good agreement with these measurements and has been used to predict attenuation lengths in other alkali halides. A theory of islanding based on a capillarity model of film nucleation has been developed which adequately explains the attenuation observed when extremely thin nonuniform films of NaCl and NaF are used.