FOURIER TRANSFORM EMISSION SPECTRA OF THE (000)-(000) BAND OF THE λ4051.6 BAND OF C_3

摘要

The (000)-(000) band of the 4051.6 A group (A ~1∏_u - X-tilde ~1Σ_g~+) of C_3 was recorded in emission with a Bruker IFS 120HR Fourier transform (FT) spectrometer at the University of Waterloo. The band was excited by a microwave discharge in isopropanol (less than a few mtorr) diluted in helium (2 torr). Our new FT data provide more reliable and accurately calibrated transition wavenumbers than those from the grating spectra given by Gausset and co-workers. Analysis of our new spectrum combined with the data by McCall and coworkers confirmed that the lower J levels in the A state were strongly perturbed, as reported by Gausset and coworkers. The unidentified lines observed by McCall and coworkers could be attributed to extra transitions to an unknown perturbing state.