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, C 6 H 6 , CCl 4 , CS 2 , C 7 H 16 , C 6 H 12 and C 6 H 14 , 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.