Analysis of the ν9 band complex of dicyanoacetylene and application of a theory of relative intensities to all subbands

Fayt, André; Vigouroux, Corinne; Winther, F.

doi:10.1016/j.jms.2004.01.004

Cited by 15 publications

(16 citation statements)

References 15 publications

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“…Rather few authors have considered the particular problem of the relative intensities of hot subband transitions [13][14][15][16]. All those experimental studies agree about the fact that, within a few percent, cold and hot bands have the same transition dipole moment.…”

Section: Hot Band Intensitiesmentioning

confidence: 99%

“…The most interesting result of both papers concerning hot band intensities is that all subbands belonging to the transition m 5 + m 4 ‹ m 4 have a factor 0.5 while the group belonging to 2m 5 ‹ m 5 have a factor of 1. Details about the calculation of those vibrational factors can be found in a paper [13] about hot band intensities in C 4 N 2 . On this basis, the vibrational factor for the intensity of the m 5 band and its associated hot subbands (Dv 5 = +1 transitions) of HC 3 N comes from the square of the matrix element of the normal coordinate q 5 :…”

Section: Hot Band Intensitiesmentioning

confidence: 99%

“…To reproduce our room temperature experimental spectra, it is clear that more hot subbands are to be introduced, but we have also to consider vibrational and rotational '-type resonances and anharmonic resonances which could induce strong intensity perturbations, as shown in the recent study of C 4 N 2 [13]. This has been possible thanks to the global rovibrational analysis programs developed in Louvain-la Neuve.…”

Section: Hot Band Intensitiesmentioning

confidence: 99%

“…Those interactions perturb the corresponding energies but they also induce a mixing of the interacting states, mixing which is given by the coefficients of the eigenvectors which are determined in the global analysis. The general procedure we have developed to calculate relative intensities of linear molecule spectra is explained with details in a paper [13] about C 4 N 2 . This procedure is applied to the m 9 perpendicular band and its numerous hot bands in the same paper [13] and to the parallel m 7 + m 9 band in Ref.…”

Section: Global Analysismentioning

confidence: 99%

“…The general procedure we have developed to calculate relative intensities of linear molecule spectra is explained with details in a paper [13] about C 4 N 2 . This procedure is applied to the m 9 perpendicular band and its numerous hot bands in the same paper [13] and to the parallel m 7 + m 9 band in Ref. [20].…”

Section: Global Analysismentioning

confidence: 99%

See 4 more Smart Citations

New infrared integrated band intensities for HC3N and extensive line list for the ν5 and ν6 bending modes

Jolly

Bénilan

Fayt

2007

Journal of Molecular Spectroscopy

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Section: Hot Band Intensitiesmentioning

confidence: 99%

Section: Hot Band Intensitiesmentioning

confidence: 99%

Section: Hot Band Intensitiesmentioning

confidence: 99%

Section: Global Analysismentioning

confidence: 99%

Section: Global Analysismentioning

confidence: 99%

See 3 more Smart Citations

New infrared integrated band intensities for HC3N and extensive line list for the ν5 and ν6 bending modes

Jolly

Bénilan

Fayt

2007

Journal of Molecular Spectroscopy

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Fourier transform microwave spectrum of HCCC15N and global analysis of the high resolution infrared and rotational spectra up to 1700cm−1

Fayt¹,

Willaert²,

Demaison³

et al. 2008

Chemical Physics

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Gas phase dicyanoacetylene (C4N2) on Titan: New experimental and theoretical spectroscopy results applied to Cassini CIRS data

Jolly

Cottini

Fayt

et al. 2015

Icarus

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International audienceDicyanoacetylene has not been observed so far in the gas phase in Titan’s atmosphere but this molecule is still on the list of the detected species, on the basis of the correspondence between a solid phase feature measured at 478 cm−1 in the laboratory and a spectral feature observed by Voyager. In this work, the infrared spectrum of gaseous C4N2 has been investigated to improve our knowledge of the band intensities and the line parameters for this molecule. Results of previously investigated bands have been revised and the intensity of the ν9 band at 107 cm−1, measured for the first time, was found to be the strongest absorption in the whole infrared domain. We have also improved the analysis of the complex rotational and hot band structure of C4N2 in order to obtain the first line lists for both bending modes ν8 and ν9. Using our radiative transfer code including the new line list of the strong ν9 band, we have searched for the signature of C4N2 at 107 cm−1 in the atmosphere of Titan utilizing Titan CIRS far infrared spectra. Despite averaging a large number of CIRS spectra at northern latitudes during the very favorable Titan winter, no gaseous C4N2 could be detected. At the 1-σ level we obtain an abundance upper limit of 5.3 × 10−10 for the limb average which is lower than or comparable to previously inferred values. As a consequence, the absence or very low amount of gaseous C4N2 makes quite puzzling its presence in the solid phase with an abundance compatible with the observed spectral feature at 478 cm−

show abstract

Analysis of the ν9 band complex of dicyanoacetylene and application of a theory of relative intensities to all subbands

Cited by 15 publications

References 15 publications

New infrared integrated band intensities for HC3N and extensive line list for the ν5 and ν6 bending modes

New infrared integrated band intensities for HC3N and extensive line list for the ν5 and ν6 bending modes

Fourier transform microwave spectrum of HCCC15N and global analysis of the high resolution infrared and rotational spectra up to 1700cm−1

Gas phase dicyanoacetylene (C4N2) on Titan: New experimental and theoretical spectroscopy results applied to Cassini CIRS data

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