INTENSITIES AND ANALYSIS OF THE $\nu_{1}+\nu_{2}$ AND $\nu_{2}+\nu_{3}$ BANDS OF $^{16}O_{3}$ NEAR $5.7 \mu m$

Loading...
Thumbnail Image

Date

1987

Journal Title

Journal ISSN

Volume Title

Publisher

Ohio State University

Research Projects

Organizational Units

Journal Issue

Abstract

Spectra of ozone generated from a *99.981 pure oxygen sample were recorded covering the 4.5 to 10 \# region at $0.005-cm^{-1}$ resolution with the McMath Fourier transform Interferometer at the National Solar Observatory on Kitt Peak. An extensive analysis of the $\nu_{1}+\nu_{2}$ and $\nu_{2}+\nu_{3}$ bands in the $5.7-\mu m$ region was performed using spectra recorded with about 10.3 and 23.7 Torr of ozone in a 50-cm long absorption cell. Using the results reported in a previous study, initial assignments involving low and medium J and $K_{a}$ values $(J-45, K_{a} = 11)$ were made, and a first calculation performed using a Hamiltonian taking into account the Coriolis-type Interaction between the rotational levels of the (110) and (011) vibrational states. From this initial set of constants an improved set of vibrational, rotational, and coupling constants was obtained which helped to extend the assignments to higher J and $K_{a}$ transitions. The process was repeated until almost all of the $\nu_{1}+\nu_{2}$ and $\nu_{2}+\nu_{3}$ lines observable in the laboratory spectra were assigned, thus extending the quantum number assignments to $J \le 57, K_{a} \le 16$ for the $\nu_{1}+\nu_{2}$ band and $J \le 55, K_{a} \le 15$ for the $\nu_{2}+\nu_{3}$ band. Using the equivalent width method, about 220 line intensities were measured with an average relative uncertainty of 10\%. Because the exact amount of ozone in the cell was not known, intensities of lines in the $\nu_{1}$ and $\nu_{3}$ bands near 10\# were also measured in the same spectrum and compared to calculated $values^{2}$ to calibrate the measurements onto an absolute intensity scale. Precise transition moment constants were then deduced for both bands from these values. From the vibrational energies, rotational, and coupling constants, as well as the transition moment constants, a list containing 7110 line positions and intensities for the $\nu_{1}+\nu_{2}$ and $\nu_{2}+\nu_{3}$ bands of ozone has been generated. Total band intensities of $0.237 \times 10^{-19}$ and $0.536 \times 10^{-19} cm^{-1}$ / molecule $cm^{-2}$ at 296 K were obtained respectively for the $\nu_{1}+\nu_{2}$ and $\nu_{2}+\nu_{3}$ bands. Numerous weak lines believed to belong to the $2\nu_{2}+\nu_{3}-\nu_{2}$ and the $2\nu_{1}+\nu_{2}-\nu_{2}$ hot bands were also observed in the spectra. Analysis of these features has not been attempted at this time.

Description

$^{1}$ A. Barbe, C. Secroan, P. Jouve, C. Camy-Peyret, and J.-H. Flaud, J. Mol. Spectrosc., 75, 103 (1979). 2 J.-M. Flaud, C. Camy-Peyret, V. Malathy Devi, C. P. Rinsland, and M. A. H. Smith, J. Mol. Spectrosc., in press.
Author Institution: Department of Physics, College of William \& Mary; Laboratoire de Physique Moleculatre et Atmosph\'{e}rique, Tour 13, 3$^{e}$ etage, Universit\'{e} Pierre et Marie Curie et C.N.R.S.; Laboratoire de Physique Moleculatre et Atmosph\'{e}rique, Tour 13, 3$^{e}$ etage, NASA Langley Research Center

Keywords

Citation