Abstract
The molecular beam magnetic resonance method previously used for the study of molecules has been extended to the study of atoms. Transitions between the members of hyperfine structure multiplets of the ground state of atoms have been observed directly. In this way the hyperfine structure intervals of the normal states of ${\mathrm{Li}}^{6}$, ${\mathrm{Li}}^{7}$, ${\mathrm{K}}^{39}$ and ${\mathrm{K}}^{41}$ have been measured. Since the measurement of frequency alone is involved, the results are of very high precision. These spectra have been observed in external magnetic fields varying from 0.05 to 4000 gauss, i.e., from the ordinary Zeeman to the complete Paschen-Back region. The lines in the pattern are completely resolved even at the low fields. The h.f.s. separations derived from measurements at different fields are in excellent agreement. Comparison is made between the ratio of the nuclear moments of ${\mathrm{Li}}^{7}$ and ${\mathrm{Li}}^{6}$ as derived from the h.f.s. measurements with the directly measured ratio. The two ratios are 3.9610 and 3.9601, respectively. They agree within the experimental error of 0.04 percent. The h.f.s. separations are given both in absolute frequency units and in wave numbers. ${{\mathrm{sec}.}^{\ensuremath{-}1}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},{\mathrm{cm}}^{\ensuremath{-}1}}{{\mathrm{Li}}^{6},228.220.007613}{{\mathrm{Li}}^{7},803.540.026805}{{\mathrm{K}}^{39},461.750.015403}{{\mathrm{K}}^{41},254.020.008474}$
Published Version
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