University of Illinois Urbana-Champaign

A Combined Mm-wave And Far-infrared Study Of Pyrazole

Tokaryk, Dennis W.

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RM10_1.pdf
6427.pdf

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https://hdl.handle.net/2142/116863

Description

Title
A Combined Mm-wave And Far-infrared Study Of Pyrazole
Author(s)
Tokaryk, Dennis W.
Contributor(s)
  • Kim, Doyeon
  • Crouse, Jeff
  • McMahon, Robert J.
  • Woods, R. Claude
  • Esselman, Brian J.
Issue Date
2022-06-23
Keyword(s)
Fundamental physics
Abstract
Pyrazole (C$_3$H$_3$N$_2$, $C_s$) is an aromatic heterocycle consisting of a 5-membered ring molecule doubly substituted with adjacent nitrogen atoms. Searches for similar heteroaromatic compounds (imidazole, furan, etc.) have been recently conducted in the interstellar medium. This study provides the necessary transition frequencies for a search for pyrazole across the frequency range of available radiotelescopes. We have collected the mm-wave spectrum of pyrazole from 130-750 MHz, which extends the previously published microwave studies from 13 to 35 MHz. The new data greatly expand the range of rotational quantum numbers observed in the ground vibrational state rotational transitions and provide transitions for over a dozen excited vibrational states. These rotational data are simultaneously analyzed with high-resolution rotation-vibration spectra of pyrazole between 500-1300 cm$^{-1}$ that we have obtained at the Canadian Light Source synchrotron’s far-infrared beam line. The considerable benefits of simultaneously analyzing mm-wave and high-res IR transitions that cover the same approximate ranges of J and K will be discussed. The results provide a thorough characterization of all eight vibrationally excited states below 950 cm$^{-1}$, of which the highest energy states ($\nu_{16}$, $\nu_{15}$, and $\nu_{14}$) form a Coriolis-coupled triad.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116863
DOI
https://doi.org/10.15278/isms.2022.RM10
Copyright and License Information
Copyright 2022 held by the authors

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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY