MILLIMETER-WAVE SPECTROSCOPY OF AMMONIA-WATER WEAKLY BOUNDED COMPLEX
Gyawali, Prakash
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https://hdl.handle.net/2142/122537
Description
Title
MILLIMETER-WAVE SPECTROSCOPY OF AMMONIA-WATER WEAKLY BOUNDED COMPLEX
Author(s)
Gyawali, Prakash
Contributor(s)
Kleiner, Isabelle
Zou, Luyao
Margulès, L.
Motiyenko, R. A.
Issue Date
2023-06-19
Keyword(s)
Large amplitude motions
internal rotation
Abstract
The broadband rotational spectra of ammonia-water (NH₃-H₂O) complex were measured in the frequency range from 50 to 250 GHz using a supersonic-jet emission spectrometer. The NH₃-H₂O complex exhibits two large amplitude motions (LAMs): almost free internal rotation of ammonia owing to very low torsional barrier (≈ 10 cm−¹), and the inversion of water characterized by relatively high barrier (≈ 700 cm−¹). Because of the latter and taking Doppler-limited resolution of spectrometer into account, we could not observe inversion tunneling splittings of a-type rotational transitions. In total, about 150 rotational transitions of NH₃-H₂O were assigned in this study. They were fitted together with the data from previous studiesᵇ using the "hybrid" Hamiltonian approachᶜ. The analysis is in progress as we are currently trying to modify the characteristics of supersonic expansion in order to achieve higher rotational temperatures and consequently to measure higher Kₐ transitions. The latest results will be presented.
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