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We have loaded an ultracold gas of fermionic atoms into a far off resonanceoptical dipole trap and precisely controlled the spin composition of thetrapped gas. We have measured a magnetic-field Feshbach resonance between atomsin the two lowest energy spin-states, |9/2, -9/2> and |9/2, -7/2>. Theresonance peaks at a magnetic field of 201.5 plus or minus 1.4 G and has awidth of 8.0 plus or minus 1.1 G. Using this resonance we have changed theelastic collision cross section in the gas by nearly 3 orders of magnitude.Comment: 4 pages, 3 figure

Resonant Control of Elastic Collisions in an Optically Trapped Fermi Gas of Atoms