Collision broadening of the OCS J1-2 line by non-polar perturbers

A double modulation microwave spectrograph complete with phase sensitive detection and frequency standard has been set up. Widths of the OCS J1-2 line in the ground vibrational state at v=24325.92 MHz as broadened by six different non-polar perturbers, C₆H₆, CCl₄, CS₂, C₇H₁₆, C₆H₁₂ and C₆H₁₄, have been measured. The linewidths have been calculated theoretically on the basis of the theory of Anderson and of Murphy and Boggs and compared with the measured values.