Time- and space resolved measurements have been made, for the first time using simultaneous Raman, Rayleigh and LIF techniques in a turbulent jet diffusion flame of CH4, diluted alternatively with N2and air. The spontaneous Raman/Rayleigh data are processed to yield instantaneous species mass fractions of CH4, O2, N2, H2O, H2, CO and CO2as well as temperature, densily and mixture fraction. The LIF data is used to obtain the OH radical mass fraction.