Lifetime and hfs of the(5s5p)P11State of Cadmium

Abstract

The lifetime and hfs of the $\mathrm{}\left(5s5p\right)\mathrm{}{}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}$ state of cadmium have been measured by the level crossing technique. Coherence narrowing of the zero-field level crossing (Hanle effect) signal has been observed and found to be in agreement with Barrats theory. The lifetime obtained from two independent experiments is 1.66±0.05×${10}^{-9\mathrm{}}$ sec. This value is considerably smaller than earlier values. The ratio of this lifetime to the $\mathrm{}\left(5s5p\right)\mathrm{}{}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$ state lifetime obtained by Byron et al. is 6.95±0.30×${10}^{-4\mathrm{}}$—in good agreement with the results of Filippov and Kuhn. The dipole interaction constant $A\left({}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}\right)$ obtained for ${\mathrm{Cd}}^{111}$ is $\left|A\right({}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}\left)\right|=186\mathrm{}\pm 4$ Mc/sec. This result is compared to that obtained by Heydenburg. Using the present lifetime measurement and the known hfs intervals for the ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$ states we find for the theoretical value of this constant $A\left({}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}\right)=-152\mathrm{}\pm 25$ Mc/sec. The single electron hfs constants for the ($5s5p$) configuration are tabulated.