The current-voltage characteristics of point contacts of the alkali metals K, Na and Li have been studied experimentally at liquid-helium temperatures. The observed structures in the spectra (d 2 V/dI 2 ) measured as a function of the applied voltage are in agreement with the structures of the phonon densities of states, and confirm pseudopotential calculations of the electron-phonon interaction parameter.
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Jansen et al. (1980) studied this question.
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