University of Illinois Urbana-Champaign

Millimeter-wave Spectra Of 5-methyl Hydantoin In Its Vibrationally Excited States

Ozeki, Hiroyuki

Content Files
5487.pdf
WJ07_5487.pdf

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https://hdl.handle.net/2142/111285

Description

Title
Millimeter-wave Spectra Of 5-methyl Hydantoin In Its Vibrationally Excited States
Author(s)
Ozeki, Hiroyuki
Contributor(s)
  • Watanabe, Soichiro
  • Kobayashi, Kaori
  • Awadu, Minami
Issue Date
2021-06-23
Keyword(s)
Astronomy
Date of Ingest
  • 2021-09-24T21:09:26Z
  • 2022-01-21T16:10:41Z
Abstract
Pure rotational spectrum of 5-methyl hydantoin (5-methyl-imidazolidine-4-one, \chem{C_4H_6N_2O_2}), known as a direct precursor of the simplest chiral amino acid Alanine, in its vibrationally excited states were measured in the frequency region of 90-180 GHz. So far, more than 500 spectral lines were recorded, and have been found to be attributed to 4 vibrational states. Guided with the results of density functional theory calculations as well as spectral intensities relative to that of the ground vibrational state, these 4 states can be assigned to fundamental bands and/or combination of these bands whose vibrational energies are considered to be less than 200 \wn. We also found that transition frequencies for one vibrational excited state can be explained within microwave spectroscopic precision by including the same set of centrifugal distortion constants as those for the ground vibrational sate. While the other spectral line frequencies showed sizeable deviations despite of inclusion of higher-order (up to the 10th order) centrifugal distortion constants. We are currently trying to conduct a perturbation analysis for these data.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111285
DOI
10.15278/isms.2021.WJ07

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY