An experimental and theoretical study of the formation of hydrogen atom in the photolysis of acetone at 193 nm is reported. The H atom photofragments are detected by the technique of vacuum ultraviolet laser-induced fluorescence (VUV-LIF) spectroscopy at 121.6 nm. The quantum yield for H atom formation from acetone photolysis at 193 nm is determined to be 0.039 +/- 0.006. The Doppler profiles of the H atom photofragments are measured by scanning the probe laser wavelength around the resonance frequency of the H atom at 121.6 nm. The nascent kinetic energy distribution of the H atom fragments is found to be characterized by a Maxwell-Boltzmann function with the temperature of 5000 K. The spatially isotropic recoil distribution in the H atom photofragmentation is observed. The potential energy surfaces for the H atom formation processes from acetone photolysis are examined using molecular orbital calculation methods. Atmospheric implications of the present result are briefly discussed.