Two-color polarization spectroscopy (TC-PS) and two-color resonant four-wave mixing spectroscopy (TC-RFWM) are used to detect photolytically produced CH3 radicals. An infrared laser pumps individual lines in the v,v(3) fundamental of the X(2)A"(2) state, and an ultraviolet laser probes the pumped levels to reveal rotationally resolved spectra of transitions to the predissociated A(2)A'(1) state. The spectra are fit with a complex Lorentzian lineshape and yield an updated value of 46 239.4+/-1.2 cm(-1) for T-0 of the B state. A detection limit of 2 x 10(13) CH3 molecules per cm(3) per quantum state is observed for these coherent double-resonance techniques. (C) 2003 Elsevier Science B.V. All rights reserved.