Speed dependence of CH3 35Cl–O2 line-broadening parameters probed on rotational transitions: Measurements and semi-classical calculations

摘要: Abstract Relaxation parameters for K -components ( ≤6) of six J → +1 rotational transitions =6, 10, 17, 22, 31 and 33) CH 3 35 Cl perturbed by O 2 are measured at room temperature with Voigt, speed-dependent Voigt Galatry profiles in order to probe the speed-dependence effects. With respect previous study Cl–N system [Guinet et al., Quant Spectrosc Radiat Transfer 2012;113:1113], higher active-gas pressures reached, providing better signal-to-noise ratios, exact expression Beer–Lambert law is introduced fitting procedure, leading, among other advantages, much more realistic low-pressure results. The broadening considered lines also computed a semi-classical method various relative velocities colliders powers characterizing dependence collisional cross-sections on speeds deduced as functions numbers . Additional calculations performed Maxwell–Boltzmann distribution show no significant difference earlier results [Buldyreva Phys Chem 2011;13:20326] obtained within mean thermal velocity approximation. Weighted sums presently Voigt-profile -broadening previously published N ones calculated yield experimental air-broadening coefficients spectroscopic databases.