A high resolution far infrared study of rotation in HN3, HNCO, HNCS, and their deuterium derivatives

Krakow, Burton; Lord, R. C.; Neely, G. O.

doi:10.1016/0022-2852(68)90027-1

Cited by 93 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This resonance is characteristic of many quasi-linear molecules, such as HNCO (Niedenhoff et al 1995b), HNCS (Niedenhoff et al 1995a), and HN 3 (Krakow et al 1968). In HOCO + , this perturbation produces non-negligible effects for rotational levels having the quantum number K a greater than 2.…”

Section: Introductionmentioning

confidence: 99%

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Bizzocchi¹,

Lattanzi²,

Laas³

et al. 2017

A&A

View full text Add to dashboard Cite

Context. HOCO+ is a polar molecule that represents a useful proxy for its parent molecule CO 2 , which is not directly observable in the cold interstellar medium. This cation has been detected towards several lines of sight, including massive star forming regions, protostars, and cold cores. Despite the obvious astrochemical relevance, protonated CO 2 and its deuterated variant, DOCO + , still lack an accurate spectroscopic characterisation. Aims. The aim of this work is to extend the study of the ground-state pure rotational spectra of HOCO + and DOCO + well into the sub-millimetre region. Methods. Ground-state transitions have been recorded in the laboratory using a frequency-modulation absorption spectrometer equipped with a free-space glow-discharge cell. The ions were produced in a low-density, magnetically-confined plasma generated in a suitable gas mixture. The ground-state spectra of HOCO + and DOCO + have been investigated in the 213-967 GHz frequency range, with the detection of 94 new rotational transitions. Additionally, 46 line positions taken from the literature have been accurately remeasured.Results. The newly-measured lines have significantly enlarged the available data sets for HOCO + and DOCO + , thus enabling the determination of highly accurate rotational and centrifugal distortion parameters. Our analysis showed that all HOCO + lines with K a ≥ 3 are perturbed by a ro-vibrational interaction that couples the ground state with the v 5 = 1 vibrationally-excited state. This resonance has been explicitly treated in the analysis in order to obtain molecular constants with clear physical meaning. Conclusions. The improved sets of spectroscopic parameters provide enhanced lists of very accurate, sub-millimetre rest-frequencies of HOCO + and DOCO + for astrophysical applications. These new data challenges a recent tentative identification of DOCO + toward a pre-stellar core.

show abstract

Section: Introductionmentioning

confidence: 99%

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Bizzocchi¹,

Lattanzi²,

Laas³

et al. 2017

A&A

View full text Add to dashboard Cite

show abstract

“…The N2 and O2 spectra are caused by air entering the cell through a leak at the rate of 0.03 Torr h-' at The spectra were photographed and the frequencies determined using the instruments and technique described earlier. [1][2][3][4][5][6][7][8][9] The spectra of both molecules appeared to consist of a very intense, closely spaced series of lines near the exciting line and a very faint, widely spaced series of lines far from the exciting line. Therefore the region around the exciting frequency (-100 cm-' to 100 cm-') was examined using a 60 Torr sample pressure, 10min exposure time and a spectral slitwidth of 0.15 cm-'.…”

Section: Methodsmentioning

confidence: 99%

Pure rotational Raman spectra of hydrazoic acid HN₃ and DN₃

Bendtsen

1977

J Raman Spectroscopy

View full text Add to dashboard Cite

The pure rotational Raman spectra of HN3 and DN3 have been photographed in the spectral range -100 Cm' to 470 cn-'. The ve intense AK = 0 transitions, ORK(J) and OSK(J), and the weak asymmetry-allowed AK = 1 and 2 transitions, QK, "QK, "SK (J) and "SK (J), were observed and measured. The analyses of the spectra with AK # 0 primarily yield information on the K-dependent parameters of the molecules. For HN3 the following constants have been determined: A = 20.3815(25) cm-'; DK = 8.706(92) X lo-' cm-'; H K = 7.38(93) x cm-'. For DN, the results are A = 11.4916(24) cm-'; DK = 2.931(36) X lo-' an-'; HK = 2.00(32) x cm-'.

show abstract

“…Strong absorptions between 20 and 30 cni-I were assigned to 'Po transitions in the low-resolution spectrum of HNCO (5). In our spectra these transitions are resolved in between the K,, pattern of the "R,,, transitions up to J " = 9, but become more and more separated from them for higher J values.…”

Section: Description Of the Spectrum And Assignmentsmentioning

confidence: 98%

“…The rotational spectrum of HNCO in the ground state ", and the first excited state of the bending vibrations, v,, v 5 , and v6, has been ~nvestigated in the microwave, mitlimetre-wave (2)(3)(4), and far infrared (IR) regions (5)(6)(7). Moreover, the v,, v,, and v6 infrared bands have been analyzed (8,9).…”

Section: Introductionmentioning

confidence: 99%

Infrared spectrum of HNCO between 8 and 80 cm⁻¹

Fusina¹,

Carlotti²,

Carli³

1984

Can. J. Phys.

View full text Add to dashboard Cite

The infrared spectrum of isocyanic acid, HNCO, has been recorded in the range 8–80 cm−1 with a resolution of about 0.004 cm−1a-type and b-type rotational transitions have been measured and assigned in the ground state and in the ν4 = 1, ν5 = 1, ν6 = 1, and ν5 = 2 vibrational states.Improved values of the ground state rotational and centrifugal distortion constants in the Ir S-reduced Hamiltonian of Watson have been obtained in a simultaneous analysis of our measurements and microwave, millimetre-wave, and far infrared data reported previously. Sub-band origins and effective spectroscopic constants have been determined for each excited vibrational state. An accurate value for the ν6 band origin, at 656.287 cm−1, has been deduced.

show abstract

A high resolution far infrared study of rotation in HN3, HNCO, HNCS, and their deuterium derivatives

Cited by 93 publications

References 13 publications

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Pure rotational Raman spectra of hydrazoic acid HN₃ and DN₃

Infrared spectrum of HNCO between 8 and 80 cm⁻¹

Contact Info

Product

Resources

About

A high resolution far infrared study of rotation in HN3, HNCO, HNCS, and their deuterium derivatives

Cited by 93 publications

References 13 publications

Accurate sub-millimetre rest frequencies for HOCO+ and DOCO+ ions

Accurate sub-millimetre rest frequencies for HOCO+ and DOCO+ ions

Pure rotational Raman spectra of hydrazoic acid HN3 and DN3

Infrared spectrum of HNCO between 8 and 80 cm−1

Contact Info

Product

Resources

About

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Accurate sub-millimetre rest frequencies for HOCO⁺ and DOCO⁺ ions

Pure rotational Raman spectra of hydrazoic acid HN₃ and DN₃

Infrared spectrum of HNCO between 8 and 80 cm⁻¹