University of Illinois Urbana-Champaign

MILLIMETER-WAVE SPECTROSCOPY OF AMMONIA-WATER WEAKLY BOUNDED COMPLEX

Gyawali, Prakash

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7014.pdf
MK08_1.pptx

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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.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/122537
DOI
https://doi.org/10.15278/isms.2023.7014

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Abstracts & Presentations - 2023 International Symposium on Molecular Spectroscopy PRIMARY