Collision broadening of C₂H₄O Lines. I. broadened by polar molecules

Abstract

A double modulation microwave spectrograph has been used to measure the linewidths of four rotational lines of C₂H₄O at 300°K broadened by three different polar molecules C₂H₄O, OCS, and CH₃CN having widely different dipole moments. The linewidths have been calculated theoretically on the basis of Anderson's theory as well as Murphy's and Boggs' theory of pressure broadening taking only the dipole‐dipole interaction. The width parameters calculated by Murphy and Boggs theory are smaller than that of Anderson's theory but are larger than the experimental values.