Line-mixing between rotational Stark components of CH3F self-perturbed and perturbed by helium: Experimental results and IOS analysis

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

“…The spectrum is then obtained from the Fourier-Laplace transform of the ACF (ie multiplying the ACF by exp( ) it  and integrating from t=0 to  ). A comparison was made [322] A C C E P T E D M A N U S C R I P T 38 between the resulting predictions, free of any scaling factor deduced from experiments, and measurements in the wings of the 3  band of CO 2 at 200 K and 296 K. A good (in the log scale used for the comparison) agreement was obtained at 296 K that degrades slightly at lower temperature. Errors locally reach a factor of two but on a quantity that varies over almost four orders of magnitude (cf Fig.…”

“…As it is well known, the lines associated with the same J but different M values can be spectrally separated by an electric field and the Stark effect. Starting from [321], an adapted IOS model was developed in [322] and applied to spectra of CH 3 F with lines separated through the Stark effect. This revealed, with good agreement with measured spectra, the overly simplified approximation made in [323] where discrepancies between measurements and calculations were obtained.…”

Division Xii / Commission 14 / Working Group Collision Processes

“…CH 3 Br: lines broadened by N 2 (T) (Boussetta et al 2011); by CH 3 Br, N 2 and O 2 (E) (Hoffman & Davies 2009); by CH 3 Br (T) (Goméz et al 2010). CH 3 F: lines broadened by CH 3 F and He (E) (Koubek et al 2011). CO: lines broadened by CO, N 2 and O 2 (E) (Koshelev & Markov 2009); by H 2 , N 2 , O 2 , CO, CO 2 and He (E) (Dick et al 2009a).…”