Millimeter and submillimeter wave spectra of 13C methylamine

R. A. Motiyenko, L. Margulès, V. V. Ilyushin, I. A. Smirnov, E. A. Alekseev, D. T. Halfen, Lucy M Ziurys

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Context. Methylamine (CH3NH2) is a light molecule of astrophysical interest, which has an intensive rotational spectrum that extends in the submillimeter wave range and far beyond, even at temperatures characteristic for the interstellar medium. It is likely for 13C isotopologue of methylamine to be identified in astronomical surveys, but there is no information available for the 13CH3NH2 millimeter and submillimeter wave spectra. Aims. In this context, to provide reliable predictions of 13CH3NH2 spectrum in millimeter and submillimeter wave ranges, we have studied rotational spectra of the 13C methylamine isotopologue in the frequency range from 48 to 945 GHz. Methods. The spectrum of 13C methylamine was recorded using conventional absorption spectrometers. The analysis of the rotational spectrum of 13Cmethylamine in the ground vibrational state was performed on the basis of the group-theoretical high-barrier tunneling Hamiltonian that was developed for methylamine. The available multiple observations of the parent methylamine species toward Sgr B2(N) at 1, 2, and 3 mm using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory were used to make a search for interstellar 13CH3NH2. Results. In the recorded spectra, we have assigned 2721 rotational transitions that belong to the ground vibrational state of the 13CH3NH2. These measurements were fitted to the Hamiltonian model that uses 75 parameters to achieve an overall weighted rms deviation of 0.73. On the basis of these spectroscopic results, predictions of transition frequencies in the frequency range up to 950 GHz with J ≤ 50 and Ka ≤ 20 are presented. The search for interstellar 13C methylamine in available observational data was not successful and therefore only an upper limit of 6.5 × 1014 cm-2 can be derived for the column density of 13CH3NH2 toward Sgr B2(N), assuming the same source size, temperature, linewidth, and systemic velocity as for parent methylamine isotopic species.

Original languageEnglish (US)
Article numberA152
JournalAstronomy and Astrophysics
Volume587
DOIs
StatePublished - Mar 1 2016

Fingerprint

submillimeter waves
wave spectrum
millimeter waves
rotational spectra
vibrational states
frequency ranges
predictions
observatories
astrophysics
antennas
telescopes
spectrometers
prediction
deviation
temperature
antenna
spectrometer
observatory
radio
molecules

Keywords

  • ISM: molecules
  • Line: identification
  • Methods: laboratory: molecular
  • Molecular data
  • Submillimeter: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Motiyenko, R. A., Margulès, L., Ilyushin, V. V., Smirnov, I. A., Alekseev, E. A., Halfen, D. T., & Ziurys, L. M. (2016). Millimeter and submillimeter wave spectra of 13C methylamine. Astronomy and Astrophysics, 587, [A152]. https://doi.org/10.1051/0004-6361/201526924

Millimeter and submillimeter wave spectra of 13C methylamine. / Motiyenko, R. A.; Margulès, L.; Ilyushin, V. V.; Smirnov, I. A.; Alekseev, E. A.; Halfen, D. T.; Ziurys, Lucy M.

In: Astronomy and Astrophysics, Vol. 587, A152, 01.03.2016.

Research output: Contribution to journalArticle

Motiyenko, RA, Margulès, L, Ilyushin, VV, Smirnov, IA, Alekseev, EA, Halfen, DT & Ziurys, LM 2016, 'Millimeter and submillimeter wave spectra of 13C methylamine', Astronomy and Astrophysics, vol. 587, A152. https://doi.org/10.1051/0004-6361/201526924
Motiyenko RA, Margulès L, Ilyushin VV, Smirnov IA, Alekseev EA, Halfen DT et al. Millimeter and submillimeter wave spectra of 13C methylamine. Astronomy and Astrophysics. 2016 Mar 1;587. A152. https://doi.org/10.1051/0004-6361/201526924
Motiyenko, R. A. ; Margulès, L. ; Ilyushin, V. V. ; Smirnov, I. A. ; Alekseev, E. A. ; Halfen, D. T. ; Ziurys, Lucy M. / Millimeter and submillimeter wave spectra of 13C methylamine. In: Astronomy and Astrophysics. 2016 ; Vol. 587.
@article{539fed02003f42b2a02187124ef53593,
title = "Millimeter and submillimeter wave spectra of 13C methylamine",
abstract = "Context. Methylamine (CH3NH2) is a light molecule of astrophysical interest, which has an intensive rotational spectrum that extends in the submillimeter wave range and far beyond, even at temperatures characteristic for the interstellar medium. It is likely for 13C isotopologue of methylamine to be identified in astronomical surveys, but there is no information available for the 13CH3NH2 millimeter and submillimeter wave spectra. Aims. In this context, to provide reliable predictions of 13CH3NH2 spectrum in millimeter and submillimeter wave ranges, we have studied rotational spectra of the 13C methylamine isotopologue in the frequency range from 48 to 945 GHz. Methods. The spectrum of 13C methylamine was recorded using conventional absorption spectrometers. The analysis of the rotational spectrum of 13Cmethylamine in the ground vibrational state was performed on the basis of the group-theoretical high-barrier tunneling Hamiltonian that was developed for methylamine. The available multiple observations of the parent methylamine species toward Sgr B2(N) at 1, 2, and 3 mm using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory were used to make a search for interstellar 13CH3NH2. Results. In the recorded spectra, we have assigned 2721 rotational transitions that belong to the ground vibrational state of the 13CH3NH2. These measurements were fitted to the Hamiltonian model that uses 75 parameters to achieve an overall weighted rms deviation of 0.73. On the basis of these spectroscopic results, predictions of transition frequencies in the frequency range up to 950 GHz with J ≤ 50 and Ka ≤ 20 are presented. The search for interstellar 13C methylamine in available observational data was not successful and therefore only an upper limit of 6.5 × 1014 cm-2 can be derived for the column density of 13CH3NH2 toward Sgr B2(N), assuming the same source size, temperature, linewidth, and systemic velocity as for parent methylamine isotopic species.",
keywords = "ISM: molecules, Line: identification, Methods: laboratory: molecular, Molecular data, Submillimeter: ISM",
author = "Motiyenko, {R. A.} and L. Margul{\`e}s and Ilyushin, {V. V.} and Smirnov, {I. A.} and Alekseev, {E. A.} and Halfen, {D. T.} and Ziurys, {Lucy M}",
year = "2016",
month = "3",
day = "1",
doi = "10.1051/0004-6361/201526924",
language = "English (US)",
volume = "587",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

TY - JOUR

T1 - Millimeter and submillimeter wave spectra of 13C methylamine

AU - Motiyenko, R. A.

AU - Margulès, L.

AU - Ilyushin, V. V.

AU - Smirnov, I. A.

AU - Alekseev, E. A.

AU - Halfen, D. T.

AU - Ziurys, Lucy M

PY - 2016/3/1

Y1 - 2016/3/1

N2 - Context. Methylamine (CH3NH2) is a light molecule of astrophysical interest, which has an intensive rotational spectrum that extends in the submillimeter wave range and far beyond, even at temperatures characteristic for the interstellar medium. It is likely for 13C isotopologue of methylamine to be identified in astronomical surveys, but there is no information available for the 13CH3NH2 millimeter and submillimeter wave spectra. Aims. In this context, to provide reliable predictions of 13CH3NH2 spectrum in millimeter and submillimeter wave ranges, we have studied rotational spectra of the 13C methylamine isotopologue in the frequency range from 48 to 945 GHz. Methods. The spectrum of 13C methylamine was recorded using conventional absorption spectrometers. The analysis of the rotational spectrum of 13Cmethylamine in the ground vibrational state was performed on the basis of the group-theoretical high-barrier tunneling Hamiltonian that was developed for methylamine. The available multiple observations of the parent methylamine species toward Sgr B2(N) at 1, 2, and 3 mm using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory were used to make a search for interstellar 13CH3NH2. Results. In the recorded spectra, we have assigned 2721 rotational transitions that belong to the ground vibrational state of the 13CH3NH2. These measurements were fitted to the Hamiltonian model that uses 75 parameters to achieve an overall weighted rms deviation of 0.73. On the basis of these spectroscopic results, predictions of transition frequencies in the frequency range up to 950 GHz with J ≤ 50 and Ka ≤ 20 are presented. The search for interstellar 13C methylamine in available observational data was not successful and therefore only an upper limit of 6.5 × 1014 cm-2 can be derived for the column density of 13CH3NH2 toward Sgr B2(N), assuming the same source size, temperature, linewidth, and systemic velocity as for parent methylamine isotopic species.

AB - Context. Methylamine (CH3NH2) is a light molecule of astrophysical interest, which has an intensive rotational spectrum that extends in the submillimeter wave range and far beyond, even at temperatures characteristic for the interstellar medium. It is likely for 13C isotopologue of methylamine to be identified in astronomical surveys, but there is no information available for the 13CH3NH2 millimeter and submillimeter wave spectra. Aims. In this context, to provide reliable predictions of 13CH3NH2 spectrum in millimeter and submillimeter wave ranges, we have studied rotational spectra of the 13C methylamine isotopologue in the frequency range from 48 to 945 GHz. Methods. The spectrum of 13C methylamine was recorded using conventional absorption spectrometers. The analysis of the rotational spectrum of 13Cmethylamine in the ground vibrational state was performed on the basis of the group-theoretical high-barrier tunneling Hamiltonian that was developed for methylamine. The available multiple observations of the parent methylamine species toward Sgr B2(N) at 1, 2, and 3 mm using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory were used to make a search for interstellar 13CH3NH2. Results. In the recorded spectra, we have assigned 2721 rotational transitions that belong to the ground vibrational state of the 13CH3NH2. These measurements were fitted to the Hamiltonian model that uses 75 parameters to achieve an overall weighted rms deviation of 0.73. On the basis of these spectroscopic results, predictions of transition frequencies in the frequency range up to 950 GHz with J ≤ 50 and Ka ≤ 20 are presented. The search for interstellar 13C methylamine in available observational data was not successful and therefore only an upper limit of 6.5 × 1014 cm-2 can be derived for the column density of 13CH3NH2 toward Sgr B2(N), assuming the same source size, temperature, linewidth, and systemic velocity as for parent methylamine isotopic species.

KW - ISM: molecules

KW - Line: identification

KW - Methods: laboratory: molecular

KW - Molecular data

KW - Submillimeter: ISM

UR - http://www.scopus.com/inward/record.url?scp=84960912714&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960912714&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201526924

DO - 10.1051/0004-6361/201526924

M3 - Article

AN - SCOPUS:84960912714

VL - 587

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A152

ER -