LINE INTENSITY MEASUREMENTS IN $^{14}N^{16}_{2}O$ AND THEIR TREATMENT USING THE EFFECTIVE OPERATOR APPROACH. II. THE 5200 TO $6400 CM^{-1}$ REGION
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Date
2002
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Ohio State University
Abstract
This work continues a series of publications devoted to the application of the effective operators approach to the analysis and prediction of vibration-rotation spectra of linear triatomic molecules. In that frame, the present work aims at describing line intensities of cold and hot bands of $^{14}N^{16}_{2}O$ in its ground electronic state in the spectral range above $3600 cm^{-1}$. In $N_{2}O$, vibrational interacting levels group in polyads, identified by the so-called polyad number $P = 2V_{1} + V_{2} + 4V_{3}$, as a result of the relation $2\omega_{1}{\sim}4\omega_{2}{\sim}\omega_{3}$ existing between the harmonic frequencies. The absorption spectra of $N_{2}O$, at room temperature, have been recorded in Brussels over the whole range between 3600 and $11000 cm^{-1}$ using a Bruker IFS120HR Fourier transform spectrometer. The measurement and analysis of absolute line intensities in the region between 4300 and $5200 cm^{-1}$, involving bands associated with transitions corresponding to $\Delta P = 7, 8$ and 9, was done $recently.^{a}$ We are now measuring absolute line intensities for cold and hot bands associated with transitions corresponding to $\Delta P = 10$ and 11, observed in the range from 5200 to $6400 cm^{-1}$. Using wavefunctions previously determined from a global fit of an effective hamiltonian to about 18000 line $positions,^{b}$ parameters of a corresponding effective dipole moment are then fitted to these experimental intensities. Results will be presented and discussed.
Description
$^{a}$L. Daumont, J. Vander Auwera, J-L. Teffo, V. I. Perevalov and S. A. Tashkun, J. Mol. Spectrosc. 208, 281-291 (2001). $^{b}$A. Camparque, G. Weirauch, S. A. Tashkun, V. I. Perevalov, and J-L. Teffo, J. Mol. Spectrosc. 209, 198-206 (2001).
Author Institution: Laboratoire de Chimie Physique Mol\'{e}culaire C. P. 160/09, Universit\'{e} Libre de Bruxelles; Groupe de Spectrom\'{e}trie Mol\'{e}culaire et Atmosph\'{e}rique, ESA CNRS 6089, Universit\'{e} de Reims, Facult\'{e} des Sciences, Moulin de la Housse; Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch; Laboratoire de Physique Mol\'{e}culaire et Applications, CNRS, bo\^{i}te 76, Universit\'e Pierre et Marie Curie
Author Institution: Laboratoire de Chimie Physique Mol\'{e}culaire C. P. 160/09, Universit\'{e} Libre de Bruxelles; Groupe de Spectrom\'{e}trie Mol\'{e}culaire et Atmosph\'{e}rique, ESA CNRS 6089, Universit\'{e} de Reims, Facult\'{e} des Sciences, Moulin de la Housse; Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch; Laboratoire de Physique Mol\'{e}culaire et Applications, CNRS, bo\^{i}te 76, Universit\'e Pierre et Marie Curie