The nonradiative decay rates of the vibrational ground state and the v(7) fundamental ill the electronically excited B (2)A(1) state of the allyl radical, C3H5, are studied by picosecond time-resolved pump-probe photoelectron spectroscopy. The states decay by internal conversion with a time constant of 20 and 16 ps, respectively. (C) 1997 American Institute of Physics.