The Autlerndash;Townes effect in nuclear magnetic resonance (NMR) and electron paramagnetic resonance has been observed using recently developed Raman heterodyne techniques. The measurements were carried out on the nitrogenhyphen;vacancy color center in diamond, where the3Aharr;3Eoptical transition was driven by a single mode dye laser at 638 nm while the magnetic transitions in the3Aground state were driven by two rf fields. The measured splittings in the NMR lines were found to be in good agreement with theoretical predictions. Using the Autlerndash;Townes effect, the magnitude of the dipole moments of themI=0harr;plusmn;1 (mS=0) transitions in the ground state was determined, and found to be the same. Comparison of this latter result with the NMR spectra shows that Raman heterodyne signal intensities are determined by population factors.
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