THE MILLIMETER AND SUBMILLIMETER-WAVE SPECTRUM OF THE $\nu_{5}$ AND $2\nu_{9}$ VIBRATIONAL STATES OF NITRIC ACID: $HNO_{3}$
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Date
1994
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Publisher
Ohio State University
Abstract
The millimeter-wave spectrum of nitric acid ($HNO_{3}$) in its $\nu_{5}$ and $2 \nu_{9}$ vibrational states has been studied. Data were taken using a TWT based broadband spectrometer. The $\nu_{5}$ and $2 \nu_{9}$ states exhibit a large perturbation from the ordinary Watson Hamiltonian due to a Fermi interaction between the energy levels. Additionally, the large torsional splitting of transitions following b-type selection rules was observed for the $2 \nu_{9}$ vibrational state. An interesting effect arising from the mixing of the $2 \nu_{9}$ and $\nu_{5}$ energy levels is the large splitting of the b-type transitions of the $\nu_{5}$ vibrational state. A smaller torsional splitting was observed for transitions following a-type selection rules inn the Q-branch transitions of both $\nu_{5}$ and $2 \nu_{9}$. The results of our analysis will be presented and compared with the results of previous studies.
Description
Author Institution: Department of Physics, The Ohio State University; Department of Physics, University of South Alabama