MICROWAVE AND TUNABLE FAR-INFRARED LASER SPECTROSCOPY OF AMMONIA-WATER DIMER
Loading...
Date
1991
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
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].
Description
$[1]$ P. Herbine and T.R. Dyke, J. Chem. Phys. 83, 3768 (1985).""
Author Institution: Department of Geology and Planetary Sciences 170-25, California Institute of Technology
Author Institution: Department of Geology and Planetary Sciences 170-25, California Institute of Technology