High resolution Raman spectroscopy of gases with laser sources. The rotational spectrum of cyanuric fluoride-C 3N 3F 3

Abstract

The pure rotational Raman spectrum of cyanuric fluoride vapor was photographed using a high resolution plane grating spectrograph. The spectrum was excited with the λ = 4880 A ̊ radiation emitted by a single-mode argon-ion laser. Two sets of molecular constants were determined from the R and S branches. The preferred results are those determined from the S-branch data. These are: B 0 = 0.0655954 ± 14 × 10 −7 cm −1, D J = (2.52 ± 0.17) × 10 −9 cm −1 and H J = (−1.59 ± 0.59) × 10 −14 cm −1, where the uncertainties are one standard deviation. Possible effects of line shifts due to unresolved K structure and the presence of hot bands on the accuracy of the values of the molecular constants are discussed. The B 0 value is compared to the rotation constant computed with the structural parameters determined with the electron diffraction technique; the agreement between these two rotation constants is only fair.