Following photodissociation of dimethyl disulfide (CH3SSCH3) in a supersonic jet with a KrF excimer laser at 248 nm, degenerate four-wave mixing spectra of the A (2)A(1)<--X E-2(3/2) transition of CH3S in a spectral region 317-377 nm are recorded using a dye laser. Observed features extend to 5020 cm(-1) above the origin, much greater than 1490 cm(-1) for fluorescence spectra and 2979 cm(-1) for fluorescence depletion spectra. In addition to extension to higher members of the known progressions 3(v) and 2(1)3(v) associated with C-S stretching (nu(3)) and CH3 umbrella (nu(2)) modes, three new progressions 1(1)3(v), 3(v)4(1), and 2(1)3(v)4(1) (or 1(1)2(1)3(v)) involving the symmetric CH3 stretching (nu(1)) and asymmetric CH3 (nu(4)) stretching modes of the A (2)A(1) state of CH3S are tentatively assigned, yielding values of nu(1)=2966 cm(-1) and nu(4)=3006 cm(-1) that are consistent with theoretical predictions. Vibrational spectral parameters for nu(1), nu(2), nu(3), and nu(4) modes of the A (2)A(1) state of CH3S are derived. (C) 2003 American Institute of Physics.