PNNL

Abstract

Fourier transform spectra of mono-13C ethylene have been recorded in the 8.4-14.3- µm spectral region (700 cm-1 to 1190 cm-1) using a Bruker 120 HR interferometer at a resolution of 0.0017 cm-1 allowing the extensive study of the set of resonating states {101, 81, 71,41,61}. Due to the high resolution available as well as the extended spectral range involved in this study, a much larger set of line assignments are now available. The present analysis has leads to the determination of more accurate spectroscopic constants including interaction constants than were obtained in earlier studies. In particular, the following band centers were derived: ?0(?10) = 825.40602(30) cm-1, ?0(?8) = 932.19572(15) cm-1, ?0(?7) = 937.44452(10) cm-1, ?0(?4) = 1025.6976(14) cm-1. Finally a synthetic spectrum was generated leading to the assignment of a number of 13C12CH4 lines observed through an earlier heterodyne spectroscopic study.