o 2 was extra dry grade 99 6 and both were used directly from their bottles without further purification the cs 2 was reagent grade and was degassed before use in order to achieve an adequate supply pressure for the cs 2 the bottle and supply lines were contained in a heating jacket and maintained at 100 u00b0 c the vacuum in the test cell was about 0 1 torr the concentrations of cs co n 2 and cs 2 were measured by the mass spectrometer sampling probe 16 in operating the combustor device 10 the combustor flame was ignited by flowing all three gases c 2 n 2 o 2 cs 2 premixed into the plenum 11 and sparking the ignitor wire with a tesla coil wall temperatures of 680 u00b0 c and 410 u00b0 c were measured by thermocouples for the downstream and upstream ends of the plenum respectively mass flow measurements were considered accurate to u00b1 2 for the c 2 n 2 and o 2 flows and to u00b1 10 for the cs 2 flow for typical operating conditions the temperature in the plenum 11 was 2750 u2245 500 k this temperature was consistent with calibrated adiabatic flame temperatures and estimated heat losses due to conduction from the hot plenum walls to the cool test cell flange heat loss based on the observed plenum wall upstream and downstream temperatures and one dimensional heat conduction was calculated to be approximately 30 w this typically represents a 10 loss of the available flow energy based on calculated adiabatic flame temperature.