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

Cazzoli, G.; Puzzarini, Cristina

doi:10.1051/0004-6361:200809938

Cited by 21 publications

(21 citation statements)

References 26 publications

(27 reference statements)

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“…[15], and therefore they are not here repeated; we only mention that they are well reproduced by the fit, i.e., within the stated accuracy. For the m 14 band the transition frequencies from Ref.…”

Section: Resultsmentioning

confidence: 88%

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Rotational spectrum of the v11=1 and v14=1 vibrational states of CH3CCCCH

Cazzoli¹,

Puzzarini²

2009

Journal of Molecular Spectroscopy

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Section: Resultsmentioning

confidence: 88%

“…(1)) and B v (i = b), the theoretical value of f v , and the experimental centrifugal distortion constants of the vibrational ground state from Ref. [15] have been used. In the above mentioned formula, q v has been estimated by [14] q…”

Section: Prediction Of the Rotational Spectramentioning

confidence: 99%

Rotational spectrum of the v11=1 and v14=1 vibrational states of CH3CCCCH

Cazzoli¹,

Puzzarini²

2009

Journal of Molecular Spectroscopy

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“…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

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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...

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“…As already pointed out in some previous works [1][2][3], methyldiacetylene is known to be a molecule of astrophysical interest. In fact, methyldiacetylene, which belongs to the methylpolyyne family, CH 3 C 2n H (n = 1, 2,. .…”

Section: Introductionmentioning

confidence: 76%