Optical properties of lead in the vacuum ultraviolet

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Abstract
The reflectance of pure films of lead deposited in ultra high vacuum has been measured at several angles of incidence in the energy range 10 to 30 eV. A computer programme has been used to determine the optical constants n and k from these data using the Fresnel equations and the real ( epsilon 1) and imaginary ( epsilon 2) parts of the complex relative permittivity together with the volume (-Im epsilon -1) and surface (-Im(1+ epsilon )-1) loss functions have subsequently been obtained. The peak in -Im epsilon -1, corresponding to the volume plasma energy, occurs at 12.7+or-0.2 eV which is in good agreement with the results of characteristic electron energy loss experiments. Maxima in epsilon 2 are found at 18.7+or-0.2 eV and 21.5 eV and are attributed to interband absorption by electrons in the OV and OIV levels.

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