An Interstellar Emission Line from Isocyanic Acid at 1.4 Centimeters

Bühl, D.; Snyder, L. E.; Edrich, J.

doi:10.1086/151740

Cited by 20 publications

(21 citation statements)

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“…The J Ka,Kc = 4 0,4 → 3 0,3 transition at 87925 MHz was detected and assigned based on the laboratory work of Kewley et al (1963). The detection was confirmed in a companion article with the observation of the 1 0,1 → 0 0,0 transition by Buhl et al (1972).…”

Section: Hnco (Isocyanic Acid)mentioning

confidence: 65%

2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules

McGuire

2018

ApJS

397

290

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To date, 204 individual molecular species, comprised of 16 different elements, have been detected in the interstellar and circumstellar medium by astronomical observations. These molecules range in size from two atoms to seventy, and have been detected across the electromagnetic spectrum from cmwavelengths to the ultraviolet. This census presents a summary of the first detection of each molecular species, including the observational facility, wavelength range, transitions, and enabling laboratory spectroscopic work, as well as listing tentative and disputed detections. Tables of molecules detected in interstellar ices, external galaxies, protoplanetary disks, and exoplanetary atmospheres are provided. A number of visual representations of this aggregate data are presented and briefly discussed in context.

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Section: Hnco (Isocyanic Acid)mentioning

confidence: 65%

2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules

McGuire

2018

ApJS

397

290

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“…S1-S3 for more 1 NH states). Again, the overall agreement between experiment and theory (solid curves) is very satisfying (the best agreement being achieved for (0,9), (1,6), (1,8)). The bimodality of the rotational state distributions of CO in the vibrational ground state, seen in the right-lower panel of Fig.…”

mentioning

confidence: 64%

“…Since its discovery in 1830 [1], HNCO has been identified in diverse media. For instance, this molecule is found in over sixty galactic sources and in nine external galaxies [2,[5][6][7][8][9]. It is relatively highly abundant and it is suggested to be strongly involved in prebiotic chemistry occurring there.…”

mentioning

confidence: 99%

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Full-Dimensional Theory of Pair-Correlated HNCO Photofragmentation

Bonnet

Linguerri

Hochlaf

et al. 2017

J. Phys. Chem. Lett.

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Full-dimensional semiclassical dynamical calculations combining classical paths and Bohr quantization of product internal motions are reported for the prototype photofragmentation of isocyanic acid in the S state. These calculations allow one to closely reproduce for the first time key features of state-of-the-art imaging measurements at photolysis wavelengths of 201 and 210 nm while providing insight into the underlying dissociation mechanism. Quantum scattering calculations being beyond reach for most polyatomic fissions, pair-correlated data on these processes are much more often measured than predicted. Our theoretical approach can be used to fill this gap.

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“…At the valve repetition rate of 5 Hz, nearly 2 million FIDs were recorded. The resulting spectrum has a high signal-to-noise ratio (SNR), and consequently the 34 S and 13 C isotopologues of HSCN were observed in natural abundance (see Figure 2) in addition to the parent isotopologues of HNCS, HSCN, and HCNS. At this level of integration, about 500 molecular lines were detected in the two bands.…”

Section: Chirped-pulse Ft Microwave Spectroscopymentioning

confidence: 99%

Molecular polymorphism: microwave spectra, equilibrium structures, and an astronomical investigation of the HNCS isomeric family

McGuire

Martin‐Drumel

Thorwirth

et al. 2016

Phys. Chem. Chem. Phys.

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The rotational spectra of thioisocyanic acid (HNCS), and its three energetic isomers (HSCN, HCNS, and HSNC) have been observed at high spectral resolution by a combination of chirped-pulse and Fabry-Pérot Fourier-transform microwave spectroscopy between 6 and 40 GHz in a pulsed-jet discharge expansion. Two isomers, thiofulminic acid (HCNS) and isothiofulminic acid (HSNC), calculated here to be 35-37 kcal mol(-1) less stable than the ground state isomer HNCS, have been detected for the first time. Precise rotational, centrifugal distortion, and nitrogen hyperfine coupling constants have been determined for the normal and rare isotopic species of both molecules; all are in good agreement with theoretical predictions obtained at the coupled cluster level of theory. On the basis of isotopic spectroscopy, precise molecular structures have been derived for all four isomers by correcting experimental rotational constants for the effects of rotation-vibration interaction calculated theoretically. Formation and isomerization pathways have also been investigated; the high abundance of HSCN relative to ground state HNCS, and the detection of strong lines of SH using CH3CN and H2S, suggest that HSCN is preferentially produced by the radical-radical reaction HS + CN. A radio astronomical search for HSCN and its isomers has been undertaken toward the high-mass star-forming region Sgr B2(N) in the Galactic Center with the 100 m Green Bank Telescope. While we find clear evidence for HSCN, only a tentative detection of HNCS is proposed, and there is no indication of HCNS or HSNC at the same rms noise level. HSCN, and tentatively HNCS, displays clear deviations from a single-excitation temperature model, suggesting weak masing may be occurring in some transitions in this source.

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An Interstellar Emission Line from Isocyanic Acid at 1.4 Centimeters

Cited by 20 publications

References 0 publications

2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules

2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules

Full-Dimensional Theory of Pair-Correlated HNCO Photofragmentation

Molecular polymorphism: microwave spectra, equilibrium structures, and an astronomical investigation of the HNCS isomeric family

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