Towards A Global Eight-state Fit Of The Rotational And Vibrational Spectra Of Hn3

Woods, R. Claude

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https://hdl.handle.net/2142/116626 Copy

Description

Title

Towards A Global Eight-state Fit Of The Rotational And Vibrational Spectra Of Hn3

Author(s)

Woods, R. Claude

Contributor(s)

• Wood, Samuel A.
• Vávra, Karel
• Urban, Stepan
• Smith, Houston H.
• Owen, Andrew N.
• Orr, Vanessa L.
• McMahon, Robert J.
• Kisiel, Zbigniew
• Kania, Patrik
• Esselman, Brian J.
• Billinghurst, Brant E.
• Amberger, Brent K.

Issue Date

2022-06-23

Keyword(s)

Fundamental physics

Abstract

Our longstanding goal has been achieving a global fit of the ground state and seven lowest excited states of \chem{HN_3} (\nub{5}, \nub{6}, \nub{4}, \nub{3}, 2\nub{5}, 2\nub{6}, and \nub{5}+\nub{6}), all of which are strongly connected by Coriolis, anharmonic, and Darling-Dennison resonance perturbations. From the combined effort of the Wisconsin and Prague groups, we observed and assigned most of the millimeter-wave spectrum from low-frequency microwave lines up to 720 GHz. Recently, we have acquired an extensive set of infrared (IR) spectral data at the Canadian Light Source (CLS), 30-5000 \wn $ $ at 0.0009 \wn $ $ resolution and pressures between 1 and 100 mTorr. This data supersedes all previous IR data, in that it provides higher sensitivity (providing transitions with higher $\textit{J}$’s and $\textit{K}$’s) and higher frequency accuracy for all the ground and fundamental states. More importantly, it has permitted assignment of thousands of lines in about 30 subbands involving the combination and overtone states. Using linear least-squares treatments of individual subbands (Fortrat or Q-branch plots), we have so far determined absolute energies of $\textit{K$_{a}$}$ = 0-7 of 2\nub{5}, $\textit{K$_{a}$}$ = 2-6 of \nub{5}+\nub{6}, and $\textit{K$_{a}$}$ = 0-6 of 2\nub{6}, using redundant measurements from multiple subbands confirmed by combination differences with known $\textit{a}$-type lines in the mm-wave spectrum. Several additional mm-wave series were assigned using improved predictions from the IR spectra, and several others have been reassigned. We present our current spectral analysis and progress on the implementation of an eight-state global fit.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116626

DOI

https://doi.org/10.15278/isms.2022.RM03

Copyright and License Information

Copyright 2022 held by the authors

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