Abstract
Radiative lifetimes and gJ factors of lower-lying even-parity levels in the Yb I spectrum have been determined by time-resolved fluorescence spectroscopy. An improved source for metastable atoms, reducing magnetic stray fields, was applied in the measurements of J=3 states. The results are: 6s6d 1D2: tau =35.2(10) ns, gJ=1.020(7); 6s6d 3D3: tau =23.4(11) ns, gJ=1.354(15); 6s7d 1D2: tau =49.8(20) ns, gJ=1.111(12); 6s7d 3D3: tau =43.1(12) ns, gJ=1.338(7); 6s7d 3D2: tau =66.5(36) ns, gJ=1.079(7); 6s7d 3D1: tau =38.4(17) ns, gJ=0.508(5); 6s7s 3S1: tau =15.9(19) ns, gJ=2.01(1); 6s8s 2S1: tau =34.3(42) ns, gJ=2.01(1); 6s8s 1S0: tau =37.9(42) ns. The lifetime data have been compared with Coulomb approximation calculations and experimental values taken from measurements of transition probabilities.
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