The development of a thermochemical technique for generating large quantities of carbon monosulfide (CS) is reported. The CS is produced from the thermal dissociation of carbon disulfide (CS 2 ) in a cyanogen-oxygen-CS 2 combustor operating at 1 atm and temperatures in excess of 2500 K. The CS is extracted from the combustor through a Mach 4 supersonic nozzle. The supersonic flow stream was sampled and then analyzed with a quadrupole mass spectrometer, and the data were compared with the results of an equilibrium calculation. Ratios for CS/CS 2 greater than two were measured. Such ratios are sufficient to fuel a CO chemical laser directly with CS.