Lifetime and hfs of the (5s5p) P11 state of cadmium

Abstract

The lifetime and hfs of the (5s5p) P11 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 sec. This value is considerably smaller than earlier values. The ratio of this lifetime to the (5s5p) P13 state lifetime obtained by Byron et al. is 6.95±0.30×10-4-in good agreement with the results of Filippov and Kuhn. The dipole interaction constant A(P11) obtained for Cd111 is |A(P11)|=186±4 Mc/sec. This result is compared to that obtained by Heydenburg. Using the present lifetime measurement and the known hfs intervals for the P23 and P13 states we find for the theoretical value of this constant A(P11)=-152±25 Mc/sec. The single electron hfs constants for the (5s5p) configuration are tabulated. © 1964 The American Physical Society.