Abstract
Rf-spectroscopic measurements in the atomic ground state of the 1.2 sec-isotope37K yielded independent values of magnetic moment μI(37K)=0.20320 (6) nm (diamagnetically corrected), hfs separation ΔW(37K)=240.2672 (7) MHz and the resulting hfs anomaly37Δ39=(0.249±0.035) · 10−2. The37K was polarized by spin exchange scattering with optically pumped87Rb; as a detector for rf transitions the asymmetry of the β-decay of the polarized37K nuclei was used. A detailed analysis of the spin exchange mechanism under the conditions of experiments of this type was performed. This led to an explanation for the observed strong enhancement of the resonance signal heights by the spin bath. Furthermore the dependence of the nuclear polarization and relaxation time constants on the strength of the hfs coupling could be demonstrated.
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