Determination of Strengths and Widths for Non-Lorentzian Lines

A new expression for semi-empirical non-Lorentzian line shape has been obtained. The absorptances in NH 3 –H 2 , HCl–CO 2 and NO–NO collisions are better represented by a line shape varying as |ν-ν 0 | -η with η=1.6 at frequencies greater than ∼1 cm -1 from the line center. For CO 2 lines, however, the Lorentzian shape seems to be valid within a large frequency interval from the line center. A method for determining the strengths and widths of non-Lorentzian lines from the equivalent width data is discussed. This method has been applied to the rotational lines of CO.