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

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

LASER DIODE SPECTRUM OF THE ν1\nu_{1} BAND OF OZONE

(1) Meeting on High Resolution I.R. Application and Development NBS. Gaithersburg – MARYLAND - U.S.A. (23-25 June 1980)Author Institution:Lines of the $\nu_{1}$ band of ozone have been accurately measured in the range $1066-1092 cm^{-1}$. The technique of measurement described elsewhere (1) uses the beatnotes of the laser diode, a stabilized $CO_{2}$ laser and two microwave sources. The generation of harmonies of the microwave frequencies leads to frequency makers distant of 1 GHz from each in a typical 24 GHz range centered on each $CO_{2}$ line (from 9 R(42)) The lines are Doppler resolved and the accuracy of measurement is better than 1 mk. In the recorded spectrum, there are also many lines of the well known $\nu_{3}$ band. A least square fit using the observed frequency of the two strongly coupled $\nu_{3}$ and $nu_{1}$ band leads to new parameters for the $\nu_{1}$ state

INFRARED AND MICROWAVE SPECTRA: ANALYSIS OF SOME ISOTOPICALLY SUBSTITUTED MOLECULES OF OZONE

Author Institution: Laboratoire de Physique, Mol\'eculaire, Facult\'e des Sciences B. P. 347, 51062 - Reims-C\'edex; Laboratoire de Spectroscopie, Hertzienne Universit\'{e} de Lille-I B.P. 36, 59650 - Villeneuve, - d'Ascq,Microwave and low resolution infrared spectra of some isotopically substituted molecules of ozone have been recorded. 1. Low temperature infrared spectra of $^{16}O_{3}$ and $^{18}O_{3}$ in gaseous state give the following zero order parameters expressed in $cm^{-1}$. ^{16}\omega_{1} = 1134.9 \quad \quad ^{18}\omega_{1} = 1070.0 ^{16}\omega_{2} = 716.0 \quad \quad ^{18}\omega_{2} = 674.7_{5} ^{16}\omega_{3} = 1089.2 \quad \quad ^{18}\omega_{3} = 1026.5 A Darling and Dennison resonance has been found. 2. 8 to 400 GHz microwave spectra of the five oxygen-18 substituted ozone molecules give the rotational constants in their ground state levels. 3. Both results lead to the anharmonic potential function of ozone