MILLIMETER WAVE INVESTIGATION OF THE HF DIMER
Loading...
Date
1983
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The rotation-inversion spectrum of the ground state of the HF dimer has been studied in a one meter stainless steel cell under equilibrium conditions at dry ice temperature in the frequency region of 60 to 125 GHz. Both K = 0 and K = 1 subband transitions have been observed, thus extending the previous $observations^{1,2}$ to higher J. In addition, with the aid of infrared combination differences, 13 P, Q, and R lines of the K = 2 subband have been identified. A fit of the higher J K = 0 and K = 1 subband lines Observed in this work as well as those previously $measured^{(1,2)}$ yields improved values for the centrifugal distortion constants. The observed microwave K = 2 lines were combined with Infrared combination differences to obtain the spectroscopic constants of the K=2 state. The inversion spitting and B rotational constants for this state are: [FIGURE] where the + or$-$sign indicates respectively the lower or upper tunnelling component and $E^{+}_{2} -E^{+}_{0}$ is the energy difference between the hypothetical J = 0 level of the K = $2^{+}$ state and the ground state. Not unexpectly the centrifugal disortion constants for the K = 2 levels are found to be anamolously large. Because of the nonridigity of the molecule it is necessary to treat each subband independently. $^{1}$T. R. Dyke, B. J. Howard and W. Klemperer, J. Chem. Phys. 56. 2664 (1972). $^{2}$B. J. Howard, T. R. Dyke, and W. Klemperer, private communications.
Description
Author Institution: Molecular Spectroscopy Division, National Bureau of Standards