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The quantum-mechanical three-body problem is one of the fundamentalchallenges of few-body physics. When the two-body interactions become resonant,an infinite series of universal three-body bound states is predicted to occur,whose properties are determined by the strength of the two-body interactions.We report on the association and direct observation of a trimer stateconsisting of three distinguishable fermions using radio-frequency (RF)spectroscopy. The measurements of its binding energy are consistent withtheoretical predictions which include non-universal corrections.

Radio Frequency Association of Efimov Trimers