Abstract
Spatial distributions of the absolute concentration of H, CH, C 2 , and C 3 reactive intermediate species have been measured by laser-induced fluorescence (LIF) in the freestream plume of a dc-arcjet. Diamond film grows from this reactive mixture on a water-cooled molybdenum substrate in a 25 Torr reactor. The temperature of the gas jet is determined from LIF measurements of the rotational distribution of CH radicals in the plume. The directed velocity of the gas plume is derived from the Doppler shift of LIF. The fraction of the feedstock hydrogen dissociated is obtained from calorimetry. The atomic hydrogen concentration and gas temperature are used to constrain a model of the gas phase chemistry in the reactive plume. Concentration measurements of CH, C 2 , and C 3 provide a stringent test for the model of the diamond precursor chemistry.
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