Molecular Interaction and Linewidth of Asymmetric Molecule SO2. III. SO2–CH3Br and SO2–SO2 Collisions

Abstract

The linewidth of the 9_1,9→8_2,6 transition of sulfur dioxide broadened by methyl bromide and sulfur dioxide itself has been measured at different pressures of the broadener. The measured linewidth for SO₂–CH₃Br collisions is 13.64 Mc/mm. The hard‐sphere collision diameter corresponding to this is 12.1 Å as compared to the kinetic collision diameter of 4.0 Å. The calculated width on the basis of Anderson's theory, assuming dipole—dipole interaction, comes out to be 22.4 Mc/mm, which is in disagreement with the experimental results. The measured linewidth for SO₂–SO₂ collisions comes out to be 11.23 Mc/mm. The effective collision diameter for this is 10.5 Å.