Laser-rf double-resonance studies of the hyperfine structure ofV51

Abstract

The laser-rf double-resonance technique has been used to study the hyperfine structure (hfs) of the excited $3d^{4}4s{}_{}{}^4{}_{}{}^{}D$ levels of ${}_{}{}^{15}{}_{}{}^{}\mathrm{V}$ in a continuation of earlier atomic-beam magnetic-resonance studies of the lower levels. The new results make it possible for the first time to distinguish clearly between the contact hfs due to the $4s$ electron and that due to core polarization associated with the $3d$ electrons. The values found for the radial hfs integrals from a systematic analysis of both the new and earlier results are compared with the relativistic Hartree-Fock values of Lindgren and Rosén. The magnetic octopole hfs interaction is measured for one level. Hyperfine constants and lifetime information, deduced from laser-fluorescence studies, are presented for the levels $3d^{4}4p{}_{}{}^4{}_{}{}^{}P_{\frac{5}{2},\frac{3}{2},\frac{1}{2}}^o{}_{}{}^{}$ at ∼25000 ${\mathrm{cm}}^{-1\mathrm{}}$ exitation.