Knowledge Bank

Laser Spectra of Ethylene in the 10 micron region have been recorded at the University of Lille with waveguide $CO2$ and $N2O$ lasers. Forty six absorption lines have been measured with an accuracy better than $0.001cm-1$. Eleven lines, the more intense ones, have been attributed to the $\nu 7$ band. The intensities of the other Lines correspond to the expected order of magnitude for the ``hot” hands from $\nu 10,\nu 8,\nu 7,\nu 4\dots$ and for the $\nu 7$ band of $H2\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C13CH2$. The diode laser spectrum of $ethylene1$ has been precisely calibrated. Using the classical spectra by D. L. $Johansen2$ the waveguide lasers spectra and the diode laser spectrum, we performed a complete rovibrational analysis of the $\nu 7,\nu 4$ and $\nu 10$ bands of ethylene. Two first order and two second order Coriolis resonances are introduced to reproduce the experimental data.