Laser-rf double-resonance measurements of the hyperfine structure in i49

The hyperfine structures of six metastable levels arising from the 3d24s and 3d3 configurations in i49 have been measured with high precision using the laser-rf double-resonance technique in a collinear laser-ion-beam geometry. The hfs constants A and B were determined to about 4 and 43 kHz, respectively. Less precise results are also reported for the 2p1/2 level of the 3d3 configuration and for five upper levels in the 3d24p configuration. For these states, the optical spectra had Doppler widths of about 40 MHz, leading to A values determined to about 1 MHz. The results are compared with the presently available Hartree-Fock (HF) calculations. Good agreement is obtained with the HF results only in some cases. Substantial corrections due to many-body interactions and relativistic effects are required for other cases. © 1992 The American Physical Society