VIBRATIONAL STATES OF OZONE

Author Institution: Laboratoire de Spectroscopie Hertzienne, Laboratoire Associ\'e au C.N.R.S. n^{\circ}; 249 Universit\'e de Lille I;The ozone molecule has its three fundamental, vibrations $\nu_{2} , \nu_{3}, \nu_{1}$ respectively located at $701\;cm^{-1} 1042\;cm^{-1}, 1103\;cm^{-1}$. The pure rotational spectrum of these states has been studied in the range 10 - 120 GHz using a Stark effect spectrometer. The results obtained will be summarized. In the $10\;\mu m$ region, some transitions between the $\nu_{3}$ or $\nu_{1}$ state and the ground state are very close to $CO_{2}$ laser emissions: on the one hand, the use of a $CO_{2}$ waveguide laser allows the measurement of some absorption frequencies: on the other, a $CO_{2}$ laser is used for optically pumping an ozone submillimeter laser. Some emission frequencies are given

CALCULATED MICROWAVE AND INFRARED SPECTRA OF ATMOSPHERIC AND INTERSTELLAR ASYMMETRIC MOLECULES FROM MICROWAVE LABORATORY MEASUREMENTS

Author Institution: Laboratoire de Spectrocopie Hertzienne, Universit\'{e} de LilleThe microwave spectra of the following light asymmetric tops have been studied in the range 10 GHz up to 500 GHz: $H_{2}O, SO_{2}, O_{3}, H_{2}CO$, HCOOH and most of their isotopic species. The present study concerns the pure rotational spectra of the molecules in their ground vibrational states and in the lower energy excited states. Using the Watson Hamiltonian, a least-squares process yields molecular constants and their statistical errors. We have available a program which allows the systematic calculation of frequencies, uncertainties and relative intensities of pure rotational or vibrrotational lines. Some examples of these calculated spectra for $SO_{2}$ and $O_{3}$ will be presented and compared with observed spectra