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D. R. WILLEY, R. E. TIMLIN JR., P. L. PONDILLO AND M. DERAMO, Dept. of Physics, Allegheny College, Meadville, PA 16335.
We will present pressure broadening results for the (J, K) = (1, 1), (2, 2) and (3, 3) inversion transitions of NH3 broadened by H2 at temperatures of 10 - 40 K. These results were obtained using a quasi-equilibrium collisionally cooled cell. When compared to previous low temperature He pressure broadening cross sections of NH3, the cross sections for low temperature H2 broadening are significantly larger. We have also used existing NH3 - H2 potential surfaces to calculate theoretical cross sections for comparison with the experimental data.