New Investigation of Millimeter-Wave Rotational Spectrum of CF₃CN in the Excited Vibrational States v₇=1 and v₈=1

Abstract

The millimeter-wave rotational spectra of the excited vibrational states v₇=1 and v₈=1 of the symmetric top molecule trifluoroacetonitrile, CF₃CN, have been analyzed again. The ζ=±1 series have been assigned and the rotational parameters including B₇ =2944.9748(14) MHz, q⁺_t=1.4505(16) MHz for v₇=1 and B₈ =2950.4853(4) MHz, q⁺_t= 3.6035(20) MHz for v₈=1states were determined accurately.