Collisional broadening of vibrational-rotational CO2 lines by buffer gases
K.I. Arshinov1, O.N. Krapivnaya1, V.V. Nevdakh2, V.N. Shut1
1Institute of Technical Acoustics, Academy of Sciences of Belarus, Vitebsk, Belarus
2Belarusian National Technical University, Belarus, 220013, Minsk, ul. Ya. Kolasa, 13
Keywords: ненасыщенный коэффициент поглощения, относительный коэффициент ударного уширения, буферный газ, unsaturated absorption coefficient, relative collisional broadening coefficient, buffer gas
Abstract
Unsaturated absorption coefficients in pure CO2 and binary mixtures of CO2 with buffer gases M j (He, Ar, Kr, Xe, N2, O2, CO, N2O, 13C16O2) were measured at the central frequencies of the R (8), R (22), R (34), P (8), P (22), and P (36) CO2 spectral lines of the 1000-0001 transition at 300-700 K with a tunable CO2 laser. A technique is described and the coefficients of self-broadening and broadening of CO2 spectral lines by a buffer gas M j are calculated. It is shown that the efficiency of CO2 interaction with diatomic and triatomic molecules is determined by the electric moment; in the case of inert gases, the mass factor plays the major role. It is ascertained that the temperature dependences of the collisional broadening of CO2 spectral lines can be highly accurate approximated by power functions with two different exponents.
|
