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Experimental control of magnetic Fano-Feshbach resonances in ultracold$^{40}$K Fermi gases, using radio-frequency (RF) fields, is demonstrated.Spectroscopic measurements are made of three molecular levels within 50 MHz ofthe atomic continuum, along with their variation with magnetic field. Modifyingthe scattering properties by an RF field is shown by measuring the loss profileversus magnetic field. This work provides the high accuracy locations of groundmolecular states near the s-wave Fano-Feshbach resonance, which can be used tostudy the crossover regime from a Bose-Einstein condensate to aBardeen-Cooper-Schrieffer superfluid in presence of an RF field.

Radio-Frequency Manipulation of Fano-Feshbach Resonances in an Ultracold Fermi Gas of $^{40}$K