Query : 2018A&A...619A.140V

2018A&A...619A.140V - Astronomy and Astrophysics, volume 619A, 140-140 (2018/11-1)

Millimeter-wave spectroscopy and modeling of 1,2-butanediol. Laboratory spectrum in the 59.6-103.6 GHz region and comparison with the ALMA archived observations.


Abstract (from CDS):

Context. The continuously enhanced sensitivity of radioastronomical observations allows the detection of increasingly complex organic molecules. These systems often exist in a large number of isomers leading to very congested spectra.
Aims. We explore the conformational space of 1,2-butanediol and provide sets of spectroscopic parameters to facilitate searches for this molecule at millimeter wavelengths.
Methods. We recorded the rotational spectrum of 1,2-butanediol in the 59.6-103.6GHz frequency region (5.03-2.89mm) using a free-jet millimeter-wave absorption spectrometer, and we analyzed the properties of 24 isomers with quantum chemical calculations. Selected measured transition lines were then searched on publicly available ALMA Band 3 data on IRAS 16293-2422 B.
Results. We assigned the spectra of six conformers, namely aG'Ag, gG'Aa, g'G'Ag, aG'G'g, aG'Gg, and g'GAa, to yield the rotational constants and centrifugal distortion constants up to the fourth or sixth order. The most intense signal belong to the aG'Ag species, that is the global minimum. Search for the corresponding 30x,30-29x,29 transition lines toward IRAS 16293-2422 B was unsuccessful.
Conclusions. Our present data will be helpful for identifying 1,2-butanediol at millimeter wavelengths with radio telescope arrays. Among all possible conformers, first searches should be focused on the aG'Ag conformers in the 400-800GHz frequency spectral range.

Abstract Copyright: © ESO 2018

Journal keyword(s): molecular data - line: identification - methods: laboratory: molecular - methods: data analysis - techniques: spectroscopic - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/619/A140): table1.dat-table12.dat>

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1251 1
2 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 282 0
3 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14383 0
4 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 123 0
5 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 504 0
6 W 51e2 PCG 19 23 43.906 +14 30 34.48           ~ 210 0

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