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Observation of ortho-para dependence of pressure broadening coefficient in acetylene ν1+ν3 vibration band using dual-comb spectroscopy
Iwakuni, Kana
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https://hdl.handle.net/2142/91145
Description
- Title
- Observation of ortho-para dependence of pressure broadening coefficient in acetylene ν1+ν3 vibration band using dual-comb spectroscopy
- Author(s)
- Iwakuni, Kana
- Contributor(s)
- Yamada, Koichi M.T.
- Sasada, Hiroyuki
- Hong, Feng-Lei
- Onae, Atsushi
- Inaba, Hajime
- Okubo, Sho
- Issue Date
- 2016-06-22
- Keyword(s)
- Spectroscopy as an analytical tool
- Date of Ingest
- 2017-01-26T21:39:09Z
- Abstract
- We observe that the pressure-broadening coefficients depend on the ortho-para levels. The spectrum is taken with a dual-comb spectrometer which has the resolution of 48 MHz and the frequency accuracy of 8 digit when the signal-to-noise ratio is more than 20\footnote{S. Okubo $et$ $al$., Applied Physics Express 8, 082402 (2015)}. \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.25]{Broadening coefficient 7-18.eps} \end{wrapfigure} In this study, about 4.4-Tz wide spectra of the $P$(31) to $R$(31) transitions in the \nub{1}+\nub{3} vibration band of \chem{^{12}C_2H_2} are observed at the pressure of 25, 60, 396, 1047, 1962 and 2654 Pa. Each rotation-vibration absorption line is fitted to Voight function and we determined pressure-broadening coefficients for each rotation-vibration transition. The Figure shows pressure broadening coefficient as a function of $m$. Here $m$ is $J”+1$ for $R$ and $–J”$ for $P$-branch. The graph shows obvious dependence on ortho and para. We fit it to Pade function considering the population ratio of three-to-one for the ortho and para levels. This would lead to detailed understanding of the pressure boarding mechanism.
- Publisher
- International Symposium on Molecular Spectroscopy
- Type of Resource
- text
- Genre of Resource
- Conference Paper / Presentation
- Language
- En
- Permalink
- http://hdl.handle.net/2142/91145
- Copyright and License Information
- Copyright 2016 by the authors
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