Linewidth parameters for Δ J=1, 0≤ J ≤ 43, rotational transitions of the sulfur dioxide molecule

A systematic study was made of the rotational quantum number (J,K) dependence of the linewidth parameters for sulfur dioxide (SO2) at 300 °K. Linewidth parameters were used to calculate effective hard‐sphere collision diameters for SO2 over the pressure range 0.001 ≤ P ≤ 0.06 torr. Linewidth parameters were calculated using the Anderson collision theory with appropriate modifications for dominant dipole‐dipole interaction between these molecules. These calculations compare favorably with the experimental values obtained. The linewidth parameter trend was explored for transitions Δ J=1, 0≤ J ≤ 43, with all transitions lying within the frequency range of the instrument 4–80 GHz.