Abstract
For the measurement of the concentration of OH radicals the intensity of the absorption spectrum is measured more easily with an emission line background than with a continuous background, provided that the pressure broadening is known. The total broadening of the OH absorption lines at 1473° K and 1 atmos. (⅔O2+⅓H2O) is observed to be 0.58 cm—1; 36 percent of this value is Doppler broadening, the rest is pressure broadening. With this figure, recent intensity measurements of the OH bands by Avramenko and Kondratjew are reinterpreted. The resulting f values of approximately 3×10—4 are in reasonable agreement with our previous measurements. The conditions are discussed under which the simple method using the line spectrum as a background is applicable.

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