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Measurements of ion cyclotron-resonance frequencies in a Penning trap, by a laser fluorescence technique, are described. This technique has been applied to indirect measurements of the proton-to-electron mass ratio and the ^9Be^+ electron g₉ factor. It is found that m{m₄}=1836. 15238 (62) (0. 34 ppm) and g₉ (^9Be^+) =2. 00226206 (42) (0. 21 ppm). Ultimately, ion cyclotron-resonance accuracies near 1 part in 10^13 should be possible.
Wineland et al. (Mon,) studied this question.
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