Infrared spectrum and molecular force field of CF2Cl2

Giorgianni, S.; Gambi, A.; Franco, Lorenzo; Ghersetti, S.

doi:10.1016/0022-2852(79)90084-5

Cited by 40 publications

(17 citation statements)

References 15 publications

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“…Two interpretations of the spectral features seen here have been proposed, the first by Goldman et al [9] and the second more recently by Giorgianni et al [10].…”

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confidence: 60%

A first study of the ν6 fundamental of CF2Cl 2

et al. 1979

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2014 Nous avons effectué l'étude spectroscopique de la molécule CF235Cl2 dans la région de 923 cm-1 avec, d'une part, un spectre de laser à diode donnant la branche Q de la bande 03BD6 et, d'autre part, un spectre par transformée de Fourier de 910 à 935 cm-1. La superposition des nombreuses bandes d'absorption dans cette région donne une grande densité de raies non isolées qui rend leur identification très difficile même à la résolution du laser à diode (0,001 5 cm-1). Nous avons, à partir de la branche Q, déterminé des constantes rotationnelles qui permettent de reproduire les raies jusqu'à J = 78. A l'aide de ces constantes, nous avons calculé la branche R et le spectre calculé est en bon accord avec le spectre par transformée de Fourier enregistré avec une résolution de 0,04 cm-1. Abstract. 2014 The spectral region near 923 cm-1 is studied by using diode laser spectra of the dominant Q-branch belonging to the CF2 35Cl2 molecule along with Fourier transform spectra of the entire region from 910 to 935 cm-1. The overlap of the many absorption bands and also the large density of lines make quantum identification difficult because even at the resolving power of the diode laser (0.001 5 cm-1) the lines observed are not pure.

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“…Two interpretations of the spectral features seen here have been proposed, the first by Goldman et al [9] and the second more recently by Giorgianni et al [10].…”

mentioning

confidence: 60%

A first study of the ν6 fundamental of CF2Cl 2

et al. 1979

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“…This relatively strong intensity for a combination band is due to a Fermi resonance with n 6 . 19 The survey spectrum (Fig. 1) shows two distant Q-branches for this A-type band, which are degraded to higher wavenumbers.…”

Section: Rovibrational Analysismentioning

confidence: 94%

“…Harmonic force fields have been reported by Giorgianni et al, 19 by using symmetry coordinates belonging to the C 2v point group, and by Davis et al, 13 by defining coordinates assuming C s symmetry for the molecule.…”

Section: Pccpmentioning

confidence: 99%

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Analysis of the ν3 + ν7 combination band of CF2Cl2 from spectra obtained by high resolution diode laser and FTIR supersonic jet techniquesElectronic supplementary information (ESI) available: line assignments for diode laser spectra for transitions ν3 and ν7 of CF235Cl2 (Table S1) and CF235Cl37Cl (Table S2). See http://www.rsc.org/suppdata/cp/b1/b110919g/

D'Amico

Snels

Hollenstein

et al. 2002

Phys. Chem. Chem. Phys.

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High resolution (0.0011 cm À1 full width half maximum) diode laser spectra have been measured for mixtures of CF 2 Cl 2 in Ne, expanded in a supersonic planar jet. In addition interferometric Fourier transform infrared (FTIR) spectra have been recorded with a resolution of about 0.004 cm À1 (FWHM, Hamming apodization) for neat CF 2 Cl 2 , expanded through a circular 200 mm nozzle. We present the analysis of the n 3 + n 7 combination band of CF 2 35 Cl 2 [ñ n 0 ¼ 888.496 89(10) cm À1 ] and CF 2 35 Cl 37 Cl [ñ n 0 ¼ 883.203 89(12) cm À1]. Absolute band strengths have been measured for all bands falling in the atmospheric window (n 3 + n 7 , n 6 , n 1 and n 8 ) and thus being important for monitoring CF 2 Cl 2 in the lower troposphere and stratosphere. A Fermi resonance coupling constant W ¼ (15 AE 2) cm À1 is estimated for the resonance between n 3 + n 7 and n 6 in both isotopomers.

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“…The vibrational cross sections were estimated with the Born approximation using optical oscillator strengths obtained from measurements by Harward [28] and Giorgianni et a1. [29].…”

Section: Evaluation Of the Cross Sectionsmentioning

confidence: 95%

Insulating properties of mixtures of nitrogen with electronegative gases

Novák

Fréchette

1984

1984 IEEE International Conference on Eletrical Insulation

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Calculations of the transport coefficients of insulating electronegative gases and their mixtures were performed under the conditions of the Townsend steadystate experiment.The Boltzmann equation was used for evaluation of the unknown collision cross sections by fitting calculated ionization coefficients, drift velocities and diffusion coefficients to experimental data.A stainless-steel vacuum chamber (lO-s torr), provided with a pair of Rogowski-profile electrodes, was set up and used to carry out a series of measurements. The ionization and attachment coefficients were evaluated from the steady-state prebreakdown currents. Results for SF6 are presented in this paper.

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Infrared spectrum and molecular force field of CF2Cl2

Cited by 40 publications

References 15 publications

A first study of the ν6 fundamental of CF2Cl 2

A first study of the ν6 fundamental of CF2Cl 2

Insulating properties of mixtures of nitrogen with electronegative gases

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