HIGH RESOLUTION FOURIER TRANSFORM STUDY OF THE MID-INFRARED BANDS OF CYCLOPROPANE

Author Institution: Department of Physics, The Pennsylvania State University; Herzberg Institute of Astrophysics, National Research Council of CanadaThe fundamental bands of the cyclopropane molecule between 6.6 and $12.6 \mu$m have been measured with a Bomem high resolution Fourier transform spectrometer. The most congested parts of the spectrum were deconvolved to an effective linewidth of $\sim 0.002 cm^{-1}$. The strong perpendicular bands in this region belong to the E' fundamentals $v_{9}$ at $1438 cm^{-1}, \nu_{10}$ at $1028 cm^{-1}$, and $\nu_{11}$ at $868 cm^{-1}$. All of these bands are affected by strong 1-type resonances and also exhibit K-doubling of the high-J lines in the $K^{\prime \prime} = 3$ subbands resulting from matrix elements of the form $$. On the other hand, only a few perturbations by other states are noticeable in these bands. The structure of the $\nu_{11}$ band is not much affected by $J_{xy}$ - Coriolis resonance with the $\nu_{7}$ fundamental of species $A_{2}^{\prime \prime}$ which appears very weakly just $14 cm^{-1}$ below $v_{11}$. A stronger perturbation is seen in the $\nu_{9}$ band whose $K = 16-17$ subband exhibits an avoided crossing with the $2\nu_{14}$ state. Spectroscopic constants resulting from a least squares treatment of the Hamiltonian matrices including these interactions will be reported