The millimeter-wave rotational spectrum of CF3CN in the excited vibrational state v8Â =Â 2

The millimeter-wave rotational spectra of the excited vibrational state v8 = 2 of the symmetric top molecule, CF3CN, have been recorded for J″ = 16 up to J″ = 32. The analysis indicates that ℓ-resonance has been observed for this molecule around (k − ℓ) = 25. The ℓ = ±2 and ℓ = 0 series have been assigned and the spectra analyzed to give rotational parameters including B = 2955.46351(49) MHz, Xℓℓ = 8783.6(78) MHz, and qt+(2,2)=3.4673(20) MHz.