Can the Inversion-Vibration Problem in the ν_4 and 2ν_2 States of NH_3 BE Solved to Experimental Accuracy?

Details Can the Inversion-Vibration Problem in the ν_4 and 2ν_2 States of NH_3 BE Solved to Experimental Accuracy? Can the Inversion-Vibration Problem in the ν_4 and 2ν_2 States of NH_3 BE Solved to Experimental Accuracy?

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..conferc02p&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Microwave (Rotational)

Scientific paper

The problem of coupling between a large amplitude motion state and a small amplitude vibration state remains an area of considerable interest and few conclusions in molecular physics. The ν_4 and 2ν_2 states of NH_3 provide an excellent opportunity to study the coupling of large and small amplitude motions in an inversion system where the quantum mechanics have been worked out in detail. In spite of the well established Hamiltonian, a large body of high quality spectra remains to fit to experimental accuracy. Several recent studies have resulted in 2-10 times the infrared accuracy over restricted ranges of quantum numbers and have either been unable to fit or have completely ignored the 162 reported microwave transitions. Assessment of the perturbations details provides some insight into why previous analyses might have not completely succeeded; however, the ability of current Hamiltonian to completely model the large amplitude inversion coupled with small amplitude vibration remains to be adequately addressed. We report extensive new measurements of the rotation-inversion transitions in the ν_4 and 2ν_2 states, a global analysis of existing data and provide a complete assessment of the inversion-rotation-vibration Hamiltonian in NH_3.
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