Laboratory Measurement Of Millimeter-wave Transitions Of 13ch2doh For Astronomical Use

Oyama, Takahiro

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https://hdl.handle.net/2142/116696 Copy

Description

Title

Laboratory Measurement Of Millimeter-wave Transitions Of 13ch2doh For Astronomical Use

Author(s)

Oyama, Takahiro

Contributor(s)

• Sakai, Nami
• sakai, takeshi
• Nakatani, Riouhei
• Watanabe, Yoshimasa
• Zeng, Shaoshan
• Tamanai, Akemi
• Ohno, Yuki

Issue Date

2022-06-22

Keyword(s)

Astronomy

Abstract

Methanol (\chem{CH_3OH}) is known to be an important precursor of various interstellar complex organic molecules. As a monodeuterated methanol, \chem{CH_2DOH} is one of the most abundant isotopologues of \chem{CH_3OH} which is often used to study the deuterium fractionation of \chem{CH_3OH} in interstellar medium.\footnote{e.g., Jørgensen $et$ $al$. 2018, A\&A, {\bf 620}, A170.} One of the problems regarding \chem{CH_2DOH} is that its emission lines are sometimes optically thick, and thus the derivation of its abundance is very difficult and frequently unreliable. Observations of its presumably optically thin \chem{^{13}C} substituted species, \chem{^{13}CH_2DOH}, would give us an opportunity to overcome this issue. In this study, the rotational transitions of \chem{^{13}CH_2DOH} have been measured in the millimeter wave region between 216 GHz and 264 GHz with an emission type millimeter and submillimeter-wave spectrometer, SUMIRE,\footnote{Watanabe $et$ $al$. 2021, PASJ, {\bf 72}, 372.} by using a deuterium and \chem{^{13}C} enriched samples.\footnote{Ohno, Oyama $et$ $al$, submitted to ApJ.} The absolute intensities for the $a$-type transitions are within 10\% from their theoretical values except for perturbed lines, whereas large differences are seen in the $b$-type transitions. Our experimental results will contribute to identify \chem{^{13}CH_2DOH} in observational spectra from respective astronomical environments, and thereby allow us to study the deuterium fractionation of \chem{CH_3OH} in various sources with accurate determination of the \chem{CH_2DOH} abundance.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116696

DOI

https://doi.org/10.15278/isms.2022.WN06

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Copyright 2022 held by the authors

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