Determination of g-factor ratios for Free Rb85 and Rb87 Atoms
The ratio of the nuclear g factor to the electronic g factor in the ground electronic state of free Rb85,87 atoms has been determined using optical pumping techniques in a magnetic field of ≤50 G. Typical linewidths were ≤15 cps. The linewidth contribution due to magnetic field effects was less than 1 cps. The ratio of electronic g factors for the Rb isotopes was also measured. The results are -gIgJ(Rb87)=4.969 914 7×(1±0.9×10-6)×10-4, -gIgJ(Rb85)=1.466 490 8×(1±2.1×10-6)×10-4, and gJ(Rb87)gJ(Rb85)=1.000 000 004 1×(1±6.0×10-9). These results were obtained from evacuated wall-coated cells having the Lorentzian line shape. Cells filled with inert buffer gases exhibited small, uncontrollable, systematic error due to non-Lorentzian line shape. In both types of cells, the Zeeman resonances exhibited frequency shifts proportional to the pumping-light intensity. The ratio gI(Rb85)gI(Rb87)=0.295 073 6×(1±2.3×10-6) was obtained by combining the results above. The combination with results of other researchers yields the chemical shift of Rb+ in aqueous solution relative to the free atom as Δσ(Rb+aqRb)=-(211.6±1.2)×10-6. Absolute values in units of the Bohr magneton for the shielded nuclear moments are derived using only g-factor ratios for free atoms: gI(Rb87)=-0.995 141 4×10-3×(1±1.0×10-6) and gI(Rb85)=-0.293 6400×10-3×(1±2.2×10-6). © 1968 The American Physical Society.
White, CW; Hughes, WM; Hayne, GS; Robinson, HG
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