Abstract
The phonon excitation spectra of Pb and Sn have been obtained from an analysis of the electron tunnel characteristics of junctions with the electrodes in the normal and the superconducting state. Metallic junctions with two different types of insulating barrier Al2O3 and Formvar, are used. The large resonant peak due to the Formvar long molecular chains has been resolved for lead. Self energy effects for the quasi-electrons in tin have been revealed and are interpreted in terms of coulombic contributions since tin is a weakly coupled electron-phonon system. Similar effects for the quasi-holes have been observed for tin in the presence of Formvar. It is also found that proper vibrations of the insulators and the metals may be reciprocally transferred.
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