# PERPENDICULAR BANDS OF CYCLOPROPANE IN THE $3.5$ $\mu m$ REGION

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 Title: PERPENDICULAR BANDS OF CYCLOPROPANE IN THE $3.5$ $\mu m$ REGION Creators: Merdes, D. W.; Pliva, J.; Pine, A. S. Issue Date: 1991 Publisher: Ohio State University Abstract: The spectrum of the cyclopropane molecule was measured in the region 2898.5 to $3157.3 cm^{-1}$ with Doppler-limited resolution using a difference frequency laser spectrometer. Deconvolution was used to further enhance the effective resolution in the main part of the highly perturbed spectrum. The region below ${\sim}$3060 $cm^{-1}$ contains perpendicular bands, including the $\nu_{9}$ fundamental of species $E^{\prime}$ in close snharmonic resonance with the $E^{\prime}$ component of the state $\nu_{7}-\nu_{9}-\nu_{14}$ and with other E states, and the $\nu_{2}+\nu_{9}$ band which borrows its intensity from $\nu_{8}$ via Fermi resonance. The $\nu_{2}+\nu_{9}$ $E^{\prime}$ state is also perturbed by anharmonic interactions with additional $E^{\prime}$ states. A comprehensive analysis of this complex system of perpendicular bands based on a Hamiltonian model of the main interactions yielded much improved spectroscopic constants for the $\nu_{8}$ fundamental, for the $\nu_{2}+\nu_{9}$ combination and for the newly observed $\nu_{7}+\nu_{9}-\nu_{14}$ state, as well as information on seven tentatively identified perturbing states. Description: Author Institution: Applied Research Laboratory, The Pennsylvania State University; Department of Physics, The Pennsylvania State University; Molecular Physics Division, National Institute of Standards and Technology URI: http://hdl.handle.net/1811/12384 Other Identifiers: 1991-MF-13