A microwave cavity measurement of collision-induced absorption in N2 and CO2 at 4.6 cm−1

Microwave cavity measurements have been extended to the 140 GHz or 4.6 cm−1 region. The details of the apparatus and method are presented. The techniques have been applied to the measurement of collision-induced absorption in N2 and CO2 at 295 K. The results are compared with measurements at lower microwave frequencies and also with far infrared measurements.