High precision hyperfine structure measurements in 185Re and 187Re

The hyperfine structure of the atomic levels 5d5 6s26Ssub(5/2) and 4Psub(5/2) in 185Re and 187Re has been studied with high precision by atomic-beam magnetic-resonance. Additional measurements were performed in the 5d5 6s24Gsub(s)ub(5/2) and 5d6 6s 6Dsub(9/2) states of 187Re. For the interpretation of the results eigenvectors in intermediate coupling have been derived by a least squares fit of all known levels of the configurations (5d + 6s)7. The ratio B(185Re)/B(187Re) is the same for the 6Ssub(5/2) and the 4Psub(5/2) state within the error limits of 6 parts in 105. Combining the present results with the known hyperfine structure data of 186Re and 188Re we find the magnetic-dipole hyperfine anomalies for the isotopic series 185-188Re. (orig.)