Laser-rf double-resonance measurements of the hyperfine structure in 49Ti II.

Abstract

The hyperfine structures of six metastable levels arising from the 3{ital d}{sup 2}4{ital s} and 3{ital d}{sup 3} configurations in {sup 49}Ti II have been measured with high precision using the laser-rf double-resonance technique in a collinear laser--ion-beam geometry. The hfs constants {ital A} and {ital B} were determined to about 4 and 43 kHz, respectively. Less precise results are also reported for the 2{ital p}{sub 1/2} level of the 3{ital d}{sup 3} configuration and for five upper levels in the 3{ital d}{sup 2}4{ital p} configuration. For these states, the optical spectra had Doppler widths of about 40 MHz, leading to {ital 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.