Abstract

The ground state hyperfine structures of 76,77,82,84mRb, 140Cs and 226Fr have been accurately measured by an atomic beam magnetic resonance method associated with laser optical pumping. In comparison with the purely optical methods a gain in accuracy of three orders of magnitude is achieved. Spectra obtained for the least abundant isotope (76Rb) give a good estimate of the sensitivity of the set up, which is favourably compared to the one obtained with classical ABMR Apparatus.

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