MICROWAVE ABSORPTION INTENSITIES AT LOW PRESSURE$^{\ast}$
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Date
1962
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Ohio State University
Abstract
The peak absorption intensities of a number of ammonia inversion lines have been measured in the pressure region from 2 to 100 microns. Measurements were made with a bridge-type spectrometer employing neither source- nor Stark-modulation, but with a mechanically chopped beam and synchronous detection. The constant peak intensity, characteristic of moderate pressures, drops off at lower pressure, as expected, but the pressure at which the decrease in intensity occurs is larger than anticipated by a factor of about 10. The pressure at which the attenuation falls to half of its moderate-pressure value varies in a regular manner with the rotational state of the molecule. Possible causes of the behavior will be discussed.
Description
$^{\ast}$ This work was supported by a grant from the United States Air Force Cambridge Research Laboratories.
Author Institution: Department of Chemistry, The University of Texas
Author Institution: Department of Chemistry, The University of Texas