FAR-INFRARED SYNCHROTRON-BASED SPECTROSCOPY OF FURAN: ANALYSIS OF THE $\nu_{14}-\nu_{11}$ PERTURBATION AND THE $\nu_{18}$ AND $\nu_{19}$ LEVELS
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Date
2011
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Publisher
Ohio State University
Abstract
The $\nu_{14}$ 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$^{-1}$ ($\nu_{13}$) \textbf{48} (1993) 1193--1202.}, 995 cm$^{-1}$ ($\nu_{7}$) \textbf{198} (1999) 348--357.} and at 1067 cm$^{-1}$ ($\nu_{6}$) \textbf{209} (2001) 136--138.}. We have taken the rotationally resolved spectrum of the \textit{c}-type $\nu_{14}$ 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 $\nu_{11}$ band at 600 cm$^{-1}$, for which transitions from the ground vibrational state are forbidden. By taking the spectra of the \textit{b}-type $\nu_{18}$ fundamental band and of the very weak \textit{c}-type $\nu_{18}$- $\nu_{11}$ band we have been able to analyze the $\nu_{14}$- $\nu_{11}$ perturbation. We have also analyzed the spectrum of the \textit{b}-type $\nu_{19}$ fundamental band.
Description
Author Institution: Department of Physics and Centre for Laser, Atomic and Molecular Sciences, University of New Brunswick, Fredericton, NB, Canada E3B 5A3; Canadian Light Source, Inc., 101 Perimeter Road, University of Saskatchewan, Saskatoon, SK, Canada S7N 0X4; Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada R3T 2N2