MICROWAVE SPECTRUM OF THE D2O DIMER
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Date
1989
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Ohio State University
Abstract
Extensive microwave measurements have been made on the (D2O)2 using a pulsed-nozzle Fourier-transform microwave spectrometer and a recently developed electric-resonance Optothermal spectrometer (EROS). The new measurements build on the previous spectroscopic work of Odutola $et al.^{1}$ and Coudert $et al.^{2}$ for the $K=0 A_{1}{^{\pm}}, B_{1}{^{\pm}}$, and $E^{\pm}$ states. Spectra have been recorded between 9 - 110 GHz and include the first observation of the $A_{2}{^{\pm}}$ and $B_{2}{^{\pm}}$ states. The tunneling splitting for the $K=0 A_{2}{^{\pm}}/B_{2}{^{\pm}}$ states is determined to be 1083.303(21) MHz, which is slightly lower than the 1172.115(14) MHz value found previously for the $A_{1}{^{\pm}}/B_{1}{^{\pm}}$ states. In addition, we report the first $K=1$ measurements on $(D_{2}O)_{2}$, giving a tunneling splittings of 1076.616(14) and 992.368(90) MHz for the $A_{1}{^{\pm}}/B_{1}{^{\pm}}$ and $A_{2}{^{\pm}}/B_{2}{^{\pm}}$ states, respectively. Searches have also been made for b or c-type $K=1-0$ transitions predicted near 100 GHz. A number of transitions have been observed but are presently unassigned.
Description
$^{1}$ J. A. Odutola, T. A. Hu, D. Prinslow, S. E. O'dell, and T. R. Dyke, J. Chem. Phys. 88, 5352 (1988). 2L. H. Coudert, F. J. Lovas, R. D. Suenram, and J. T. Hougen, J. Chem. Phys. 87, 6290 (1987).
Author Institution: Molecular Spectroscopy Division, National Institute of Standards and Technology
Author Institution: Molecular Spectroscopy Division, National Institute of Standards and Technology