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 Copy

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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