Laboratory Measurement of CH317OH Transitions in the Frequency Range from 216 to 264 GHz for Astronomical Application

Laboratory Measurement of CH317OH Transitions in the Frequency Range from 216 to 264 GHz for Astronomical Application

Methanol is one of the most abundant complex organic molecules in interstellar environments. Molecular lines of its rare isotopologues ^12 CH _3 ^17 OH and ^12 CH _3 ^18 OH therefore play a crucial role in examining the column density of ^12 CH _3 ^16 OH, which serves as a reference for organic mole...

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Bibliographic Details
Main Authors: Akemi Tamanai, Takahiro Oyama, Yoshimasa Watanabe, Takeshi Sakai, Riouhei Nakatani, Shaoshan Zeng, Isabelle Kleiner, Nami Sakai
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astrophysical Journal
Subjects:
Molecular spectroscopy
Line positions
Experimental data
Astrochemistry
Online Access:https://doi.org/10.3847/1538-4357/ad9b16
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Summary:Methanol is one of the most abundant complex organic molecules in interstellar environments. Molecular lines of its rare isotopologues ^12 CH _3 ^17 OH and ^12 CH _3 ^18 OH therefore play a crucial role in examining the column density of ^12 CH _3 ^16 OH, which serves as a reference for organic molecular chemistry in interstellar clouds. In this study, we have recorded the spectroscopic emission spectrum of ^12 CH _3 ^17 OH in the frequency range between 216 and 264 GHz by making use of an emission-type millimeter and submillimeter spectrometer. We have specifically paid attention to the Q -branch transitions, which are the strongest line series in this frequency region. Among the stable oxygen isotopes, ^16 O, ^17 O, and ^18 O of methanol, only ^12 CH _3 ^17 OH obviously shows line profiles having double and/or triple peaks in low- J transitions, due to the nuclear quadrupole interaction. The newly obtained ^12 CH _3 ^17 OH data will play an important role in facilitating a deeper understanding of the organic chemistry related to star and planet formation. The ^12 CH _3 ^17 OH line data allow us to trace and constrain the isotopic ratio ^17 O/ ^18 O in methanol, which is efficient to investigate the galactic-scale evolution of elements. In addition, we also assigned some transitions of ^13 CH _3 ^17 OH in the recorded spectrum.
ISSN:1538-4357

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