A first study of the ν6 fundamental of CF2Cl 2

Abstract

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.

IR Band Profiling of Dichlorodifluoromethane in the Greenhouse Window: High-Resolution FTIR Spectroscopy of ν2 and ν8

“…14 It can be seen that only a few bands have been studied using high-resolution techniques, whereas the remainder have been studied using medium to low resolution. In the first high-resolution infrared investigation of R12, carried out by Nordstrom et al in 1979, the ν 6 antisymmetric CCl 2 stretch band of C 35 Cl 2 F 2 around 923 cm −1 was studied using a diode laser and a FTIR spectrometer. 16 Jones and Morillon-Chapey carried out infrared-microwave double resonance spectroscopy on the ν 6 band of C 35 Cl 2 F 2 , 17 followed a few years later by similar studies on C 35 Cl 37 ClF 2 18 and on C 37 Cl 2 F 2 and hotbands of C 35 Cl 2 F 2 and C 35 Cl 37 ClF 2 .…”

“…In the first high-resolution infrared investigation of R12, carried out by Nordstrom et al in 1979, the ν 6 antisymmetric CCl 2 stretch band of C 35 Cl 2 F 2 around 923 cm −1 was studied using a diode laser and a FTIR spectrometer. 16 Jones and Morillon-Chapey carried out infrared-microwave double resonance spectroscopy on the ν 6 band of C 35 Cl 2 F 2 , 17 followed a few years later by similar studies on C 35 Cl 37 ClF 2 18 and on C 37 Cl 2 F 2 and hotbands of C 35 Cl 2 F 2 and C 35 Cl 37 ClF 2 . 12 In 1988, Snels and Meerts re-examined the ν 6 band of C 35 Cl 2 F 2 and of C 35 Cl 37 ClF 2 in a molecular beam using a diode laser.…”

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/

“…16 Earlier investigations of the n 6 band have been performed by Jones et al 17,18 by infrared-microwave double resonance techniques. At that time diode laser measurements at room temperature performed by Nordstrom et al 22 were insufficiently resolved to allow for a rovibrational analysis. However, a few years later Snels and Meerts 23 used a supersonic jet expansion to obtain cold (15 K) diode laser spectra, which showed 2 and 3.…”