MICROWAVE INTENSITY MEASUREMENTS AT LOW TOTAL AND PARTIAL PRESSURES
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Date
1968
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Ohio State University
Abstract
Operation of a microwave spectrometer under saturated conditions has been demonstrated as a means of separating relaxation time information from molecular concentration information for pure rotational $transitions.^{1}$ This technique has been shown to yield accurate partial pressure determinations for the absorbing $species.^{2}$ At very low pressures $(<3 \times 10^{-3} torr)$, however, the variation of the signal with partial pressure is no longer linear and is dependent upon the mole fraction of the absorber. Experiments determining the precise nature of this nonlinearity will be described and the results of these experiments will be presented along with examples of applications to the problems of chemical analysis of gaseous mixtures.
Description
This work has been supported by the National Aeronautics and Space Administration. $^{1}$Howard W. Harrington, J. Chem. Phys. 46 3698-3707 (1967). $^{2}$Edgar A. Rinehart, 155th Nat'l ACS meeting, Div. of Anal. Chem., paper No. 150.
Author Institution: Department of Physics, University of Wyoming
Author Institution: Department of Physics, University of Wyoming