Superconductive tunneling in vanadium with gaseous impurities

Electron-tunneling measurements have been made in vanadium films containing varying amounts of gaseous impurities. Transition temperatures $T_c$ vary from near the bulk value to more than 2 K below it. After corrections are made for spurious leakage conductivity, tunneling characteristics are in all cases consistent with a simple BCS superconducting density of states. $T_c$ and the zero-temperature energy gap $\epsilon \mathrm{}\left(0\right)\mathrm{}$ vary in accordance with $\frac{2\epsilon \mathrm{}\left(0\right)\mathrm{}}{k{T}_c}=3.5\mathrm{}\pm 0.1$. In consequence, it does not appear that gaseous impurities enter the vanadium lattice in a paramagnetic configuration.