CHF₂Cl and CH₃CF₂Cl Detection by Coherent Anti-Stokes Raman Scattering and Photoacoustic Raman Spectroscopy

Abstract

The coherent anti-Stokes Raman scattering (CARS) and photoacoustic Raman spectroscopy (PARS) spectra of gaseous CHF 2 Cl and CH 3 CF 2 Cl in the 3000 cm -1 region are reported for the first time. Several vibrational bands are observed related to C-H stretch fundamentals of CHF 2 Cl isotopomers, and to CH 3 stretches and the first overtone of CH 3 deformation of CH 3 CF 2 Cl. The simultaneous detection of CARS/PARS signals aids the assignment of the isotopomer bands. Both methods are appropriate for detection of these compounds and can be applied in chemical dynamics studies.

Sound emission from the gas of molecular superrotors

“…Nonlinear change of refractive index gives rise to filamentation (recent reviews of this broad topic can be found in [1,2]), whereas spatially localized heating results in the formation of acoustic waves [3][4][5][6][7][8] and long-lived gas density perturbations [9][10][11]. Photo-acoustic vibrational Raman spectroscopy has been successfully utilized for chemical detection and trace analysis [12,13].…”

Torsional splittings in the diode laser slit-jet spectra of the ν6 fundamental of 1-chloro-1,1-difluoroethane (HCFC-142b)

“…Several low resolution studies of the infrared [13][14][15][16] and Raman spectra [13,14,17] of HCFC-142b have been reported and the assignment of the vibrational modes has been established by harmonic force field calculations [15,18,19]. The exact wavenumber of the lowest vibrational band, the torsional mode m 18 is still uncertain.…”

High-Resolution Infrared Study of the ν7, ν8, and ν15 Bands and Millimeter-Wave Investigation of the v8 = 1 State of CF2Cl–CH3

“…Several low-resolution studies of the infrared (2-5) and Raman spectrum (2,3,6) of DFCE have been reported, and the assignment of the vibrational fundamentals has been supported by ab initio calculations of the harmonic force field at different levels of theory (4,7,8).…”