# MICROWAVE AND TUNABLE FAR-INFRARED LASER SPECTROSCOPY OF AMMONIA-WATER DIMER

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 Title: MICROWAVE AND TUNABLE FAR-INFRARED LASER SPECTROSCOPY OF AMMONIA-WATER DIMER Creators: Stockman, P. A.; Bumgarner, R. E.; Suzuki, S.; Green, P. G.; Blake, Geoffrey A. Issue Date: 1991 Abstract: Microwave and fur-infrared spectra of the $H_{3}N-HOH$ dimer were recorded from 36 to 86 GHz and from 520 to 800 GHz in a planar supersonic jet. The microwave data extended the previous $K=0$ manifold measurements of Herbine and Dyke $^{[1]}$ to higher frequency and also provided a complimentary set of ground state transitions in the $K=1$ manifold. The far-infrared data contained 2 sets of 3 bands, one set shifted from the other by an approximately constant 113 MHz splitting. The bands were assigned to $lm,K>\leftarrow lm"",K"">$ transitions $10,\pm 1>\leftarrow 10,0 >,l\pm 1,0>\leftarrow l\pm 1,\pm 1>$, and $l\pm 1,\pm 2>\leftarrow l\pm1,\pm 1>$, where m is the $NH_{3}$ internal rotation quantum number. The 113 MHz splitting arises from the in-plane water tunnelling motion. From these data were obtained rotational constants and structural parameters. Non-linear least-squares fits to an internal rotor Hamiltonian also provided a limit on the height of the barrier to rotation for the $NH_{3}$ monomer. [FIGURE]. URI: http://hdl.handle.net/1811/12379 Other Identifiers: 1991-ME-9