An extensive vibronic band system of the FS2 radical in the 700-485 nm region has been observed for the first time by laser-induced fluorescence (LIF) probing of the products of the reaction of F-2 with various sulfur-containing compounds. Jet-cooled spectra were obtained by reacting fluorine with COS, H2S, or CS2 in the body of a continuous supersonic jet, just prior to expansion. Vibrational analysis of the jet spectra gives nu(1)’ = 768, nu(2)’ = 217, nu(3)’ = 495, nu(1)" = 705, nu(2)" = 293, nu(3)" = 684, and T-00 = 14922 cm(-1), all in good agreement with ab initio predictions for the FS2 free radical. A rotational analysis of the high-resolution spectrum of the 3(0)(5) band shows that the transition is polarized out-of-plane, with spin splittings characteristic of a molecule with a single unpaired electron. The rotational constants and spin-rotation interaction constants were determined with good precision for the ground and excited states. By combining the rotational constants with our ab initio estimates of the S-F bond length, the following structural parameters were obtained : r(S-F) = 1.651 Angstrom, r(S-S) = 1.865(5) Angstrom, and theta(FSS) = 109.1(1)degrees for the ($) over tilde X(2)A" state and r(S-F) = 1.642 Angstrom, r(S-S) = 2.105(5) Angstrom, and theta(FSS) = 97.6(1)degrees for the ($) over tilde A(2)A’ state.