MICROWAVE AND TUNABLE FAR-INFRARED LASER SPECTROSCOPY OF $N_{2}-H_{2}O$.

[1] H.O. Leung, M.D. Marshall, R.D. Suenram and FJ. Lovas, J. Chem. Phys. 90,700(1989). [2] R.E. Bumgarner and G.A. Blake, Chem. Phys. Lett 161,308(1989).Author Institution: Division of Geological and Planetary Sciences 170-25, California Institute of TechnologyMicrowave spectra in the region between 20 and 75 GHz and tunable FIR laser spectra in the region between 400 and 700 GHz have been recorded for $^{14}N_{2}-H_{2}O$. A water tunneling motion produces A and B symmetry states and nitrogen tunneling further splits the levels into A1/A2 and B1/82 states. Kp= 0, microwave spectra have been recorded in the 0-20 GHz range by Leung et. al [1]. We have extended their Kp =0 measurements to higher frequency using our previously described direct absorption microwave spectrometer [2]. With our laser sideband spectrometer, we have observed four bands in the 400-700GHz region corresponding to Kp=0-1 transitions for each symmetry state. These transitions allow all three rotational constants and an average the K=0 and K=1 tunneling frequencies to be determined. The average water tunneling splitting is 31.5 GHz