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The intensity of OH emission from various small regions of Bunsen-type flames of hydrogen, acetylene, methane, and propane, premixed with oxygen, has been observed spectroscopically and corresponding rotational temperatures have been determined by an iso-intensity method. An ultraviolet grating monochromator of high resolution was used; fuel to oxygen ratios were varied from about 0.5 to 2 times the stoichiometric value; and rotational temperatures were determined at several positions within each flame. The measured temperatures of the reaction zone varied little with mixture ratio for a given fuel and were greater than adiabatic, suggesting a lack of thermal equilibrium. In the hot gases beyond the reaction zone, however, evidence was found of both rotational and electronic equilibrium. The concentration of thermally produced OH in the burned gases was found to be so great that it tends to mask the emission from the reaction zone.

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A blackbody was constructed of graphite which could be inductively heated in an atmosphere of helium to a maximum temperature of 2700°K. This blackbody was used as a source of radiant energy in the calibration of a grating spectroradiometer. The calibration was made over the spectral range of 2600 to 3800 A in the second order, and of 3300 to 7550 A in the first order. The accuracy of the calibrations was estimated to be of the order of 9% in the regions 2600 to 2800 A in the second order, and 7000 to 7550 A in the first order, and of 5% in the regions 2800 to 3800 A in the second order, and 3300 to 7000 A in the first order.

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