The v10=1 Level of Propyne, H3CCCH, and Its Interactions with v9=1 and v10=2

Müller, H. S. P.; Pracna, P.; Horneman, V.‐M.

doi:10.1006/jmsp.2002.8661

Cited by 24 publications

(36 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We use the CDMS entry for the vibrational ground state (Cazzoli & Puzzarini 2008) and first excited state 10 = 1 (Müller et al 2002) of the main isotopologue (tag 40 502 version 3, 40 504 version 1), and the JPL entries for the 13 C isotopologues (tags 41 002, 41 003, and 41 004, all version 1) which are based on Dubrulle et al (1978) 11 . Sgr B2(N): the parameters of all entries related to propyne are listed in Table 19.…”

Section: Propyne Ch 3 Cchmentioning

confidence: 99%

Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)

Беллоче

Müller

Menten

et al. 2013

A&A

385

523

View full text Add to dashboard Cite

Context. The discovery of amino acids in meteorites fallen to Earth and the detection of glycine, the simplest of them, in samples returned from a comet to Earth strongly suggest that the chemistry of the interstellar medium is capable of producing such complex organic molecules and that they may be widespread in our Galaxy. Aims. Our goal is to investigate the degree of chemical complexity that can be reached in the interstellar medium, in particular in dense star-forming regions. Methods. We performed an unbiased, spectral line survey toward Sgr B2(N) and (M), two regions where high-mass stars are formed, with the IRAM 30 m telescope in the 3 mm atmospheric transmission window. Partial surveys at 2 and 1.3 mm were performed in parallel. The spectra were analyzed with a simple radiative transfer model that assumes local thermodynamic equilibrium but takes optical depth effects into account. Results. About 3675 and 945 spectral lines with a peak signal-to-noise ratio higher than 4 are detected at 3 mm toward Sgr B2(N) and (M), i.e. about 102 and 26 lines per GHz, respectively. This represents an increase by about a factor of two over previous surveys of Sgr B2. About 70% and 47% of the lines detected toward Sgr B2(N) and (M) are identified and assigned to 56 and 46 distinct molecules as well as to 66 and 54 less abundant isotopologues of these molecules, respectively. In addition, we report the detection of transitions from 59 and 24 catalog entries corresponding to vibrationally or torsionally excited states of some of these molecules, respectively, up to a vibration energy of 1400 cm −1 (2000 K). Excitation temperatures and column densities were derived for each species but should be used with caution. The rotation temperatures of the detected complex molecules typically range from ∼50 to 200 K. Among the detected molecules, aminoacetonitrile, n-propyl cyanide, and ethyl formate were reported for the first time in space based on this survey, as were five rare isotopologues of vinyl cyanide, cyanoacetylene, and hydrogen cyanide. We also report the detection of transitions from within twelve new vibrationally or torsionally excited states of known molecules. Absorption features produced by diffuse clouds along the line of sight are detected in transitions with low rotation quantum numbers of many simple molecules and are modeled with ∼30-40 velocity components with typical linewidths of ∼3-5 km s −1 . Conclusions. Although the large number of unidentified lines may still allow future identification of new molecules, we expect most of these lines to belong to vibrationally or torsionally excited states or to rare isotopologues of known molecules for which spectroscopic predictions are currently missing. Significant progress in extending the inventory of complex organic molecules in Sgr B2(N) and deriving tighter constraints on their location, origin, and abundance is expected in the near future thanks to an ongoing spectral line survey at 3 mm with ALMA in its cycles 0 and 1. The present single-dish surve...

show abstract

Section: Propyne Ch 3 Cchmentioning

confidence: 99%

Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)

Беллоче

Müller

Menten

et al. 2013

A&A

385

523

View full text Add to dashboard Cite

show abstract

“…This beamline has enjoyed a very productive history over the past 15 years [11][12][13][14][15][16][17][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] , achieving a remarkable standard deviation of just 0.00010 cm À1 for some 1900 fitted transitions. The first figure of this paper is reproduced here as Fig.…”

Section: Max-labmentioning

confidence: 99%

“…1. Propyne continued as the subject of further papers based on MAX-lab spectra [17,31,44], and the excellent wavenumber precision which was possible in the far-IR region was utilized, together with non-SR results from other labs, to establish improved wavenumber standards based on CO 2 ,C S 2 , and H 2 O [35,36].…”

Section: Max-labmentioning

confidence: 99%

High-resolution infrared spectroscopy with synchrotron sources

McKellar

2010

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

“…In response to the need for more precise laboratory rest frequencies and, therefore, to improve the spectroscopic data set available, the ground-state rotational spectrum of methylacetylene was investigated in the submillimeter-wave region by Müller et al (2002), whereas that of methyldiacetylene was accurately measured in the 8−224 GHz frequency range by Bester et al (1984). To our knowledge, the latter are the most recent laboratory investigations carried out for the main isotopic species of Article published by EDP Sciences CH 3 CCH and CH 3 CCCCH, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge, the latter are the most recent laboratory investigations carried out for the main isotopic species of Article published by EDP Sciences CH 3 CCH and CH 3 CCCCH, respectively. As far as methylacetylene is concerned, it should be noted that this molecule was extensively studied in the past, and we refer the reader to Müller et al (2002) for a comprehensive summary. Here, we only recall that Wlodarczak et al (1988) performed the first investigation of the submillimeter-wave rotational spectrum of methylacetylene, Graner et al (1989) carried out the first precise determination of the A 0 rotational constant, and Urban et al (1995) obtained reliable ground-state rotational energies by means of conventional, as well as Padé approximant approaches.…”

Section: Introductionmentioning

confidence: 99%

Lamb-dip spectrum of methylacetylene and methyldiacetylene: precise rotational transition frequencies and parameters of the main isotopic species

Cazzoli

Puzzarini

2008

A&A

View full text Add to dashboard Cite

Context. Methylacetylene and methyldiacetylene are the first members of the methylpolyynes series, CH 3 C 2n H (n = 1, 2). Their astrophysical relevance has motivated this spectroscopic study. Aims. The aim of this investigation is to provide very accurate rest frequencies, as well as to improve the spectroscopic parameters available in the literature for these molecules. Methods. The Lamb-dip technique was exploited in order to record the rotational spectra of CH 3 CCH and CH 3 CCCCH at subDoppler resolution in the millimeter-and submillimeter-wave frequency ranges. In addition, for CH 3 CCH rotational transitions in the THz region were recorded at Doppler resolution. Results. We report the most accurate ground-state rotational parameters known at the moment for the main isotopic species of methylacetylene, as well as of methyldiacetylene. Conclusions. Since both molecules are known to be of astrophysical relevance, we are confident that the improvement in the accuracy of the ground-state rotational parameters as well as of the rest frequencies of rotational transitions could be useful for future observations purposes.

show abstract

The v10=1 Level of Propyne, H3CCCH, and Its Interactions with v9=1 and v10=2

Cited by 24 publications

References 11 publications

Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)

Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)

High-resolution infrared spectroscopy with synchrotron sources

Lamb-dip spectrum of methylacetylene and methyldiacetylene: precise rotational transition frequencies and parameters of the main isotopic species

Contact Info

Product

Resources

About