15min:

D. W. TOKARYK, S. D. CULLIGAN, Department of Physics and Centre for Laser, Atomic and Molecular Sciences, University of New Brunswick, Fredericton, NB, Canada E3B 5A3; B. E. BILLINGHURST, Canadian Light Source, Inc., 101 Perimeter Road, University of Saskatchewan, Saskatoon, SK, Canada S7N 0X4; AND J. A. VAN WIJNGAARDEN, Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada R3T 2N2.

The ₁₄ vibrational level of furan lies 603 cm^-1 above the ground vibrational state. It is the lowest lying vibrational level for which a transition from the ground state is allowed. Other groups have conducted rotational analyses on fundamental bands of furan at 745 cm^-1 ( ₁₃), 995 cm^-1 ( ₇) and at 1067 cm^-1 ( ₆). We have taken the rotationally resolved spectrum of the c -type ₁₄ band at the Canadian Light Source synchrotron with a Bruker IFS125HR Fourier transform spectrometer operating at 0.00096 cm^-1 resolution, and have found it to be perturbed by the ₁₁ band at 600 cm^-1, for which transitions from the ground vibrational state are forbidden. By taking the spectra of the b -type ₁₈ fundamental band and of the very weak c -type ₁₈- ₁₁ band we have been able to analyze the ₁₄- ₁₁ perturbation. We have also analyzed the spectrum of the b -type ₁₉ fundamental band.