Pressure Effects of Argon and Helium on the Resonance Lines of Silver

The shift and the broadening of $\mathrm{Ag} \lambda \lambda 3280$ and 3382 produced by argon and helium for pressures up to 83.3 atmospheres at about 950°C were determined. The shift of Pb 2833 was also measured under the same conditions. Argon produces a red shift and a slight red asymmetry, while helium produces a violet shift and a very slight violet asymmetry for all these lines. The ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ component of silver resonance lines is shifted more than the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ component. The relative difference in the shift is much more pronounced for helium than for argon. For helium the ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ component is shifted about six times greater than the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ component.