LOW-TEMPERATURE HYDROGEN BROADENED LINEWIDTHS OF AMMONIA IN THE (0,1,0,0)[-(0,0,0,0) BAND AT 200-K

Fourier transform spectra of the (0,1,0,0) <-- (0,0,0,0) band of ammonia have been measured for values of the hydrogen broadened linewidth parameters at a temperature of 200 K. The halfwidths for > 200 lines have been determined with an average RMS of 5% in the interval between 750 and 1250 cm-1. No measurements of the widths in the (s)R branch, and only 12 widths in the (s)Q branch, were obtained because of severe blending of the J-K manifolds. The broadening coefficients vary between 0.06 and 0.14 cm-1/atm. for (J,K) < (12,12).