author={Carlos Cabezas and Jos{\'e} Cernicharo and J. L. Alonso and Marcelino Ag{\'u}ndez and Santiago Mata and M. Gu{\'e}lin and Isabel Pe{\~n}a},
  journal={The Astrophysical Journal},
We report on the detection of hydromagnesium isocyanide, HMgNC, in the laboratory and in the carbon-rich evolved star IRC+10216. The J = 1–0 and J = 2–1 lines were observed in our microwave laboratory equipment in Valladolid with a spectral accuracy of 3 KHz. The hyperfine structure produced by the nitrogen atom was resolved for both transitions. The derived rotational constants from the laboratory data are B0 = 5481.4333(6) MHz, D0 = 2.90(8) KHz, and eQq(N) = −2.200(2) MHz. The predicted… 

Submillimeter wave spectroscopy of ethyl isocyanide and its searches in Orion

Context. About 40 cyanide compounds have been detected in the interstellar medium, but only 3 examples of organic isocyanide compounds were observed in this medium. Ethyl isocyanide is one of the

Alkaline and Alkaline-earth Cyanoacetylides: A Combined Theoretical and Rotational Spectroscopic Investigation.

The theoretical calculations predict that the linear isomer with formula MCCCN (M= Li, Na, Mg and Ca) is the most stable one for the four metallic cyanoacetylides investigated by combined spectroscopy measurements and theoretical calculations.

Structure and Spectroscopic Properties of Hydrocalcium Isocyanide Isomers: Plausible Astronomical Ca-bearing Molecules

Recently, the first Ca-bearing molecule discovered in space, calcium isocyanide, CaNC, has been detected in the IRC+10216 circumstellar envelope. Related to CaNC are closed-shell stable molecules of

Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H.

The synthesis of these magnesium cyanides and acetylides in IRC +10216 can be explained in terms of a two-step process initiated by the radiative association of Mg+ with large cyanopolyynes and polyynes followed by the dissociative recombination of the ionic complexes.

Cyanide/isocyanide abundances in the interstellar medium – III. The excitation of Al and Mg compounds

Cyanide species are the most common metal-containing molecules in the circumstellar gas. The exact determination of their abundances requires accurate molecular data. For this purpose, collisional

A matrix isolation ESR investigation of the MgCH radical.

The MgCH radical and its magnesium-25, carbon-13, and deuterated isotopologs have been isolated in low temperature neon matrices and examined by the matrix isolation electron spin resonance technique

Generation and structural characterization of aluminum cyanoacetylide.

A first investigation of a metallic cyanoacetylide, AlC3N, using laser ablation molecular beam Fourier transform microwave spectroscopy and a set of accurate rotational and nuclear quadrupole coupling constants are determined.

Magnesium radicals MgC5N and MgC6H in IRC +10216

After the previous discovery of MgC3N and MgC4H in IRC +10216, a deeper Q-band (31.0–50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we

A matrix isolation ESR and theoretical study of MgN.

The low-lying electronic states of MgN were investigated using the complete active space multiconfigurational self-consistent field technique and theoretical parameters for the ground state with a configuration of 5σ26σ27σ12π12π1 were able to be determined.



Laboratory Spectroscopy of MgNC: The First Radioastronomical Identification of Mg-bearing Molecule

The linear MgNC radical was detected, for the first time, by laboratory microwave spectroscopy, and six unidentified lines in IRC +10216 reported by Guelin et al. (1986) were assigned to the


A new interstellar molecule, KCN, has been identified toward the circumstellar envelope of the carbon-rich asymptotic giant branch star, IRC+10216—the fifth metal cyanide species to be detected in

Detection of the SiNC radical in IRC+10216

Following discovery of the free radical SiCN in the C-star envelope IRC+10216, we report the detection in the same source of its isomer SiNC. The microwave spectra of SiNC and SiCN were studied in

Detection of MgCN in IRC +10216: A New Metal-bearing Free Radical

A new metal-containing molecule, MgCN, has been detected toward the late-type star IRC + 10216, using the NRAO 12 m and IRAM 30 m telescopes. The N = 11 approaches 10, 10 approaches 9, and 9

More Metal Cyanide Species: Detection of AlNC (X 1 Σ + ) toward IRC +10216

A new metal-containing species, AlNC, has been detected toward the circumstellar envelope of the late-type carbon star IRC +10216, using the IRAM 30 m telescope. The J = 11 → 10, 12 → 11, and 13 → 12


A new interstellar molecule, FeCN (X4Δi), has been detected in the envelope of the carbon-rich asymptotic giant branch star, IRC+10216. This work is the first definitive detection of an iron-bearing

The Salty Scrambled Egg: Detection of NaCl Toward CRL 2688

NaCl has been detected toward the circumstellar envelope of the post-AGB star CRL 2688 using the IRAM 30 m telescope, the first time this molecule has been identified in a source other than IRC

Probing the dust formation region in IRC +10216 with the high vibrational states of hydrogen cyanide ,

We report the detection in IRC +10216 of 63 rotational transitions of HCN, most of them with quantum numbers J = 3–2, pertaining to 28 different vibrational states with energies up to 10 700 K

Seven conformers of L-threonine in the gas phase: a LA-MB-FTMW study.

The rotational and nuclear quadrupole coupling constants extracted from the analysis of the rotational spectrum are directly compared with those predicted by ab initio methods to achieve the conclusive identification of seven different conformers.

On the formation of metal cyanides and related compounds in the circumstellar envelope of IRC + 10216

Various pathways to the metal cyanides Na(CN), Mg(CN) and Al(CN) - some of which have been detected in the circumstellar envelope IRC + 10216 - are critically assessed. Calculations of rate