ANALYSIS OF THE $2 u_{4}$ HARMONIC RAND OF $^{12}CH_{4}$
G. Pierre, J. Cadot, R. J. Corice, Kenneth R. Fox · The Knowledge Bank (The Ohio State University) · 1976
The infrared spectrum of the $2_{\ u4}$ vibration rotation band of $^{12}CH_{4}$ has been recorded at $100^\\circ K$. The temperature dependence of line intensities made it possible to determine approximate values for the ground-state J values and to assign some lines. We were then able to compute the spectrum using Moret-Bailly’s formalism up to second order of approximation. The spectrum was computed using ten molecular constants for the excited state; the computed spectrum agrees very well with the experimental one. About one hundred transitions were identified; the standard deviation between computed and experimental data is $0.15 cm^{-1}$.