FAR-INFRARED SELF-BROADENING AND PRESSURE SHIFT MEASUREMENTS OF METHYL CYANIDE

Pressure shifts and self-broadening parameters of the J=43<--42, J=44< --43, J=56<--55 and J=68<--67 sub-bands of the 1A1 ground state of (CH 3CN)-N-14 up to K=10 were determined using the NIST tunable far-infrar ed (TuFIR) spectrometer . The pressure shift agrees well with theoreti cal predictions made using Anderson-Tsao-Curnutte theory. The self-bro adening parameter shows the expected K depencence. However, the predic tions are systematically too large for decreasing J. The influence of the TuFIR power spectrum on the derived experimental parameters was ev aluated and a comparison was made between two-wave and three-wave mixi ng spectroscopy.