ANALYSIS OF THE PERPENDICULAR BANDS OF CYCLOPROPANE IN THE $3.3 \mu$m REGION
Loading...
Date
1984
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The C-H stretching region of the spectrum of the cyclopropane molecule between 2898 and $3157 cm^{-}$ was recorded using the difference-frequency laser spectrometer system. Parts of the spectrum were deconvolved to $\sim 1/2$ of the Doppler width ($\sim 0.002 cm^{-1}$). The main bands in this region are the fundamentals $\nu_{6}(A^{\prime \prime})$ and $\nu_{8}(E^{\prime})$ accompanied by a number of combination bands enhanced by resonances with the fundamentals. The upper state of the perpendicular band $\nu_{8}$ occurring near $3022 cm^{-1}$ is in Fermi resonance with $\nu_{2} +\nu_{9}$, which appears fairly strongly near $2934 cm^{-1}$, and with $\nu_{7}+\nu_{9}+\nu_{14}$ located only $9 cm^{-1}$ above $\nu_{8}$. Additional weaker perturbations of the $\nu_{8}$ state have also been identified. The $\nu_{2}+\nu_{9}$ combination is in turn very severely perturbed by several other states. A Hamiltonian matrix including the $\nu_{8}, \nu_{2} + \nu_{9}, \nu_{7} + \nu_{9} + \nu_{14}$, and several other perturbing states has been used for the treatment of the observed energy levels with the aid of our program system SYMTOP. The resulting ``deperturbed'' spectroscopic constants and the interaction constants will be reported. Highly accurate values of the ground state constants $B_{o}, D^{o}_{J}$, and $D^{o}_{JK}$ have also been obtained in the analysis.
Description
Author Institution: Department of Physics, The Pennsylvania State University; Molecular Spectroscopy Division, U.S. National Bureau of Standards