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We have performed a quantitative electrodynamic experiment on a Josephson oxide tunneling junction. Using a current source at 30 Mc/sec, we have verified the time dependence of the Josephson equation, j=j₀ sin ₋-ₑ- (2e), where () ₋-ₑ- (2e) l^rA=- (2eV). Thus the limiting voltage is shown to obey the quantum relationship relationship, 2eV=. Measurements were made completely in the coherent state showing the diffraction nature of the junction as a function of applied magnetic field. The Josephson (parametric) inductance of the junction was directly observed and is in good agreement with the theory.
Silver et al. (Fri,) studied this question.