It is shown that in using the two-frequency technique of Prior et al. for investigation of the hyperfine structure of atoms with integral $J$, any resonance observed may arise from a two-quantum transition (${\nu }_{\alpha }+{\nu }_{\beta }=\frac{\Delta E}{h};{\nu }_{\alpha }\ne {\nu }_{\beta }$) rather than from two successive single-quantum jumps. Although this feature requires that care be used in interpreting the observed resonance frequencies, it appears to extend the usefulness of the technique as a spectroscopic tool.

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