Inversion relaxation cross sections for theJ=3,K=2 upper state of NH3were measured using a beam maser spectrometer. Scattering gases were NH3, ND3, HCl, and H2O. For NH3ndash;NH3scattering the angular resolution was varied from 1.5deg; to 0.2deg; with little effect on cross sections. Cross sections for NH3and ND3as scattering gases were equal within experimental error. The result that beam maser cross sections are relatively independent of angular resolution is discussed. Calaculated angular resolution corrections are compared with values of beam attenuation cross sections and total cross sections obtained from the present data. Comparison is made between our pure state (sgr;1) and superposition state (sgr;11) cross sections and recent gashyphen;cell data.
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