Broad-band high-resolution rotational spectroscopy for laboratory astrophysics

Cernicharo, J.; Gallego, J. D.; López-Pérez, J. A.; Tercero, F.; Tanarro, Isabel; Beltrán, Francisco; Vicente, P. de; Lauwaet, Koen; Alemán, Belén; Moreno, E.; Herrero, Víctor J.; Doménech, José Luis; Ramirez, Saul; Bermúdez, Celina; Peláez, Ramón J.; Patino-Esteban, M; López-Fernández, I.; Sonia, Garcia-Alvaro; García-Carreño, P; Cabezas, Carlos; Malo, I.; Amils, Ricardo; Sobrado, Jesús Manuel; C., Díez-González,; Hernández, J. M.; Tercero, B.; Santoro, Gonzalo; Martínez, Lidia; Castellanos, M.; Jiménez, B Vaquero; Pardo, J. R.; Barbas, L.; López-Fernández, Jesús A.; Aja, B.; Leuther, A.; Martín‐Gago, José A.

doi:10.1051/0004-6361/201935197

Cited by 21 publications

(22 citation statements)

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“…Observations at centimeter (cm) and millimeter (mm) wavelengths probe the cool, outer part of AGB winds and bring wealthy evidence of molecular species, from simple radicals such as OH to more complex species like cyanopolyynes. In previous works, linear carbon-chain molecules like C n H, HC 2n+1 N, and C n S are observed to be abundant in the circumstellar envelopes of carbon-rich AGB stars (Winnewisser & Walmsley 1978;Cernicharo & Guélin 1996;Guélin et al 1997;Agúndez et al 2014;Gong et al 2015;Agúndez et al 2017). These molecules are proposed to be related to the formation and destruction of polyaromatic hydrocarbons (PAH) (Henning & Salama 1998;Tielens 2008).…”

Section: Introductionmentioning

confidence: 96%

“…From Table 1, we find that existing surveys cover the frequency range from 4 GHz to 636.5 GHz for IRC +10216. Over 80 species ) have been discovered toward IRC +10216, including unusual carbon-chain and silicon-carbon molecules such as SiC 2 , MgCCH, NCCP and SiCSi (Thaddeus et al 1984;Cernicharo et al 2010;Agúndez et al 2014;Cernicharo et al 2015b), metal cyanides/isocyanide such as MgNC, MgCN, AlNC, KCN, FeCN, NaCN, HMgNC and SiH 3 CN (Ziurys et al 1995(Ziurys et al , 2002Pulliam et al 2010;Zack et al 2011;Agúndez et al 2012;Cabezas et al 2013;Agúndez et al 2014), and even metal halides such as NaCl, KCl, AlCl and AlF (Cernicharo & Guélin 1987;Ziurys et al 1995;Quintana-Lacaci et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…( ) The FWHM beam sizes are listed for single-dish, the angular resolutions are listed for interferometers. ( †) There are some other surveys using of IRC +10216 IRAM 30m, although only partially published, e.g., Cernicharo & Guélin (1987, 1996; Guélin et al (1997Guélin et al ( , 2000;…”

Section: Introductionmentioning

confidence: 99%

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A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

Zhang

Zhu

et al. 2017

A&A

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A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz is carried out using the Shanghai Tian Ma 65 m Radio Telescope (TMRT-65m) with a sensitivity of < 7 mK. Thirty-five spectral lines of 12 different molecules and radicals are detected in total. Except for SiS, the detected molecules are all carbon-chain molecules, including HC 3 N, HC 5 N, HC 7 N, HC 9 N, C 6 H, C 6 H − , C 8 H, SiC 2 , SiC 4 , c-C 3 H 2 and l-C 5 H. The presence of rich carbon-bearing molecules is consistent with the identity of IRC +10216 as a carbon-rich AGB star. The excitation temperatures and column densities of the observed species are derived by assuming a local thermodynamic equilibrium and homogeneous conditions.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

Zhang

Zhu

et al. 2017

A&A

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“…In the second part of the experiment, the emission rotational spectrum of glutaronitrile was recorded from 72 to 116.5 GHz at room temperature using the GACELA (GAS CEll for Laboratory Astrophysics) spectrometer constructed at the Yebes Observatory (Spanish National Geographic Institute (IGN)). The detailed description can be found in Cernicharo et al (2019). The broadband high resolution rotational spectrometer is equipped with radio receivers similar to those used in radio astronomy to search for molecular emission in space.…”

Section: Methodsmentioning

confidence: 99%

Rotational spectroscopy and astronomical search for glutaronitrile

Cabezas

Bermúdez

Endo

et al. 2020

A&A

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Context. Nitriles constitute almost 15% of the molecules observed in the interstellar medium (ISM), surprisingly only two dinitriles have been detected in the ISM so far. The lack of astronomical detections for dinitriles may be partly explained by the absence of laboratory rotational spectroscopic data. Aims. Our goal is to investigate the rotational spectrum of glutaronitrile, N≡C−CH2−CH2−CH2−C≡N, in order to allow its possible detection in the ISM. Methods. The rotational spectrum of glutaronitrile was measured using two different experimental setups. A Fourier transform microwave spectrometer was employed to observe the supersonic jet rotational spectrum of glutaronitrile between 6 and 20 GHz. In addition, the mmW spectrum was observed in the frequency range 72−116.5 GHz using a broadband millimetre-wave spectrometer based on radio astronomy receivers with fast Fourier transform backends. The spectral searches were supported by high-level ab initio calculations. Results. A total of 111 rotational transitions with maximum values of J and Ka quantum numbers 54 and 18, respectively, were measured for the gg conformer of glutaronitrile. The analysis allowed us to accurately determine the rotational, nuclear quadrupole coupling, quartic and sextic centrifugal distortion constants. These rotational parameters were employed to search for glutaronitrile in the cold and warm molecular clouds Orion KL, Sgr B2(N), B1-b and TMC-1, using the spectral surveys captured by IRAM 30 m at 3 mm. Glutaronitrile was not detected, and the upper limits’ column densities were derived. Those are a factor of 1.5 and 5 lower than those obtained for the total column densities of the analogous succinonitrile in Orion KL and Sgr B2, respectively.

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“…The longest carbon chains detected in the ISM are C 8 H/C 8 H -, HC 9 N, C 3 S, and HC 5 O, for hydrogen, nitrogen, sulfur, and oxygen-bearing species, respectively. [64][65][66][67][68][69][70] In TMC-1, for example, lines of single 13 C-C 3 S have been reported, but no evidence has been found for C 5 S, despite the availability of precise laboratory rest frequencies 71 for more than 20 years, and construction of new single-dish telescopes, such as the 100 m GBT telescope, which have even greater collecting area. A tentative detection has been reported at higher frequencies in IRC+10216.…”

Section: Production Of Longer Sulfur-terminated Carbon-chainsmentioning

confidence: 99%

Vibrational satellites of C₂S, C₃S, and C₄S: microwave spectral taxonomy as a stepping stone to the millimeter-wave band

McGuire

Martin‐Drumel

Lee

et al. 2018

Phys. Chem. Chem. Phys.

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We present a microwave spectral taxonomy study of several hydrocarbon/CS2 discharge mixtures in which more than 60 distinct chemical species, their more abundant isotopic species, and/or their vibrationally excited states were detected using chirped-pulse and cavity Fourier-transform microwave spectroscopies. Taken together, in excess of 85 unique variants were detected, including several new isotopic species and more than 25 new vibrationally excited states of C2S, C3S, and C4S, which have been assigned on the basis of published vibration-rotation interaction constants for C3S, or newly calculated ones for C2S and C4S. On the basis of these precise, low-frequency measurements, several vibrationally exited states of C2S and C3S were subsequently identified in archival millimeter-wave data in the 253-280 GHz frequency range, ultimately providing highly accurate catalogs for astronomical searches. As part of this work, formation pathways of the two smaller carbon-sulfur chains were investigated using 13C isotopic spectroscopy, as was their vibrational excitation. The present study illustrates the utility of microwave spectral taxonomy as a tool for complex mixture analysis, and as a powerful and convenient 'stepping stone' to higher frequency measurements in the millimeter and submillimeter bands.

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Broad-band high-resolution rotational spectroscopy for laboratory astrophysics

Cited by 21 publications

References 51 publications

A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

Rotational spectroscopy and astronomical search for glutaronitrile

Vibrational satellites of C₂S, C₃S, and C₄S: microwave spectral taxonomy as a stepping stone to the millimeter-wave band

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Broad-band high-resolution rotational spectroscopy for laboratory astrophysics

Cited by 21 publications

References 51 publications

A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

Rotational spectroscopy and astronomical search for glutaronitrile

Vibrational satellites of C2S, C3S, and C4S: microwave spectral taxonomy as a stepping stone to the millimeter-wave band

Contact Info

Product

Resources

About

Vibrational satellites of C₂S, C₃S, and C₄S: microwave spectral taxonomy as a stepping stone to the millimeter-wave band