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Spectral Lines
Published in Ronald L. Snell, Stanley E. Kurtz, Jonathan M. Marr, Fundamentals of Radio Astronomy, 2019
Ronald L. Snell, Stanley E. Kurtz, Jonathan M. Marr
The molecules hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) are isomers — molecules with the same chemical formula, but different molecular structures. In this case, both are linear molecules, but the ordering is different. The J = 1 − 0 transition frequencies are about 90,663 and 88,632 MHz for HNC and HCN, respectively, while their dipole moments are 3.05 and 2.98 debye. Which molecule has a longer lifetime in the J = 1 state before undergoing a radiative transition to the ground state?
Geophysics, Astronomy, and Acoustics
Published in W. M. Haynes, David R. Lide, Thomas J. Bruno, CRC Handbook of Chemistry and Physics, 2016
W. M. Haynes, David R. Lide, Thomas J. Bruno
Mol. form. AlCl AlF AlHO AlO ArH+ CAlN CF+ CH CH+ CHMgN CHN Name Aluminum monochloride Aluminum monofluoride Aluminum hydroxide Aluminum monoxide Argon monohydride ion Aluminum isocyanide Fluoromethylidynium ion Methylidyne Methyliumylidene Magnesium hydride isocyanide Hydrogen cyanide Isotopic species* Al35Cla Al37Cla AlFa 27AlOHa AlOa 36ArH+ 38ArH+ AlNCa CF+ CH 13CH CH+ 13CH+ HMgNCa HCN H13CN HC15N H13C15N DCN HNC H15NC HN13C
Spin–spin coupling constants in linear substituted HCN clusters
Published in Molecular Physics, 2019
Puspitapallab Chaudhuri, Lucas C. Ducati, Angsula Ghosh
Hydrogen cyanide (HCN) is among the smallest molecules, but it is extremely important in the context of quantum chemical investigations. HCN is present everywhere, ranging from cold, dark interstellar clouds, far away from earth to all places in the terrestrial environment. It was discovered in 1971 in six different interstellar sources including Orion A and Sgr A [1]. Later, it was observed in other extraterrestrial environments [2–4]. HCN is one of the most important astromolecules and extensive research has been performed, over the years, to understand its formation and destruction pathways in the interstellar medium (ISM). It plays a major role in the synthesis of the astromolecule, aminoaceitonitrile (AAN) which is an important precursor of glycine molecule in the astrophysical environment [5–7]. Several different organic molecules can be synthesised in the laboratory with the active participation of HCN in the chemical reaction process. On the other hand, HCN possesses a remarkable ability to form long hydrogen-bonded linear and cyclic clusters which makes it an important model molecule for the investigations on the physical and chemical properties of non-covalent interactions in molecular systems. On the other hand, hydrogen isocyanide (HNC) is also an important molecule in astrochemistry. It is as abundant as HCN in the extraterrestrial space and actively participates in the formation of other astromolecules. Both possess similar and high dipole moments which facilitate the process of detection in radio astronomy. However, as far as the energetic stability is concerned, HCN is 15 kcal/mol more stable than HNC [8].
Collision of C2 with NH and deuterated analogs in the interstellar medium. Scattering calculations
Published in Molecular Physics, 2023
Parisa Fereidounpour, Shapour Ramazani
NCC-H was formed with −440.2 kJ mol−1 relative to the reactant’s energy. This trajectory continued with hydrogen approaching and bonding to one of the carbon atoms, therefore the N–C double bond became a triple bond and HCCN was formed. The cyano methylene radical (HCCN) has just been discovered for the first time in a cold dark cloud with an abundance ratio of 1.2 ± 0.3, which the high abundance of HCCN is probably explained by the high abundance of HCN and HNC [42]. It has been reported that Hydrogen cyanide (HCN) and hydrogen isocyanide (HNC) with two rotational transitions were observed in 11 cirrus cores and 27 Clemens-Barvainis translucent cores [43].