The Infrared Spectrum of Methyl Cyanide Between 1240 and 1650 cm−1: The Coupled Band System ν3, ν±16, and ν7 + ν±28

High-Resolution Infrared Spectrum of CD3CN: Analysis of the Interacting ν3 and ν6 Bands and Evaluation of the A0 Constant

“…We first thought that this perturbation is caused by |v 8 = 3, 8 = −3; J, K = 7 through an (2, 2) resonance. Later, when we had included in the model another (2, 8 . Taking this (2, 2) resonance into account is not that important for explaining the whole ν 6 spectrum, but it gives information for fixing the position of 3ν…”

“…Both the hot bands have been analyzed in Ref. (5) together with the PAPE band (ν 6 + ν 8 ) 0 . When the structure of the ν 6 band in the crossing region was understood based on the Coriolis resonance and the lines were marked, there remained evident series in the spectrum.…”

“…In addition to that, ν 3 and ν 6 interact through other mechanisms. There are also anharmonic and -type resonances through which the components of the overtone 3ν 8 and the binary combinations ν 4 + ν 8 and ν 7 + ν 8 pertub the ν 6 band. The rough vibrational energy level diagram in Fig.…”

“…Meanwhile we have performed a study of the PAPE (parallel band with perpendicular structure) band ν 6 + ν 8 around 1380 cm −1 (5). In that study the inclusion of the hot bands ν 6 + ν 8 − ν 8 played an important role. The spectrum of the ν 6 band has also been applied in assigning some CD 3 CN FIR laser lines (6).…”

The near infrared cavity-enhanced absorption spectrum of methyl cyanide

“…Tolonen et al [46] assigned 4000 lines to the  4 ,  7 and 3 8 bands. Paso et al [47] took FTS data in the region between 1240 and 1650 cm -1 and assigned 3900 lines to the  6 and  7 +  8 bands. High resolution (0.0025 cm -1 ) measurements of the  4 and  7 fundamental bands of CD 3 CN are described in Ref.…”