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Title:ACCURATE 14NH3 ROVIBRATIONAL IR ANALYSIS AT 6000 CM−1
Author(s):Huang, Xinchuan
Contributor(s):Toon, Geoffrey C.; Brown, Linda R.; Schwenke, David ; Lee, Timothy ; Sung, Keeyoon
Subject(s):Mini-symposium: Large Amplitude Motions
Abstract:Ammonia is an important “weed” molecule in interstellar medium, planetary and exoplanetary atmosphere studies. In last ten years, new experimental IR analysis have been reported in the extended region between 5000 \wn (or 2 $\mu$m) and 10,000 \wn (or 1 $\mu$m). But reliable line list is still missing for the 6000 \wn (or 1.63 $\mu$m) region. Combining the JPL experimental measurements with the line positions predicted on our Ames-Pre3 potential energy surface and the 296K intensity predicted by the UCL-C2018 line list, we have been able to successfully assign more than 1300 transitions in that range. The transitions belong to following bands: \nub{2}+\nub{3}+\nub{4} (0111), \nub{1}+\nub{2}+\nub{4} (1101), 3\nub{2}+\nub{3} (0310), \nub{1}+3\nub{2} (1300), 6\nub{2} (0600s),and a "hot" band 2\nub{2}+\nub{3}+\nub{4} (0211) -- \nub{2} (0100). The combination difference for the determined experimental energy levels are about 1E-3 \wn, close to the resolution of lab measurements. Our Ames-Pre3 predictions for most J=0-10 transitions are found to be accurate within $\pm$ ~0.05 \wn, better than the C2018 line positions. Newly determined band origins and rovibrational levels will be presented along with band-by-band simulations comparing to the observed spectra. More complete Effective Hamiltonian model analysis is the target due for future work.
Issue Date:23-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107320
Date Available in IDEALS:2020-06-26


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