LINE INTENSITIES CALCULATIONS IN THE PURE TORSION-ROTATION BANDS OF HYDROGEN PEROXIDE:

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Using high resolution Fourier transform spectra $(\sim 0. 002 cm^{-1})$ recorded at IROE and at Giessen, it was possible to measure 2072 line intensities from the torsion-rotation spectrum of $H_{2}O_{2}$ in the $25-400 cm^{-1}$ spectral region. These intensities were introduced in a least squares fit calculations to get the expansion of the transition moment operator of the torsion-rotation band of $H_{2}O_{2}$. Finally a synthetic spectrum of the far infrared absorption of $H_{2}O_{2}$ was generated, using for the line intensities the dipole moment expansion determined in this work and for the line positions the parameters from $Camy-Peyret et al^(1)$: in addition to the the vibration-rotation resonances involving the ground state and the $\nu_{3} = 1$ vibrational state, the $model^(1,2)$ used to calculate the positions and intensities takes into account the torsional effect i.e. the torsional dependence of the dipole moment and the $(\Delta\top = \pm 1, \Delta K_{a}=\pm 2)$ torsion-rotation resonances within the ground vibrational state, together with the ``staggering'' effect which is due to the tunnelling through the cis-barrier. Financial support from the European Community under contract EV5V-CT92-0076 is gratefully acknowledged.

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1. C. Camy-Peyret, J. -M. Flaud, J. W. C. Johns, and M. Noel, J. Mol. Spectrosc. 155, 84 (1992) 2. J. -M. Flaud, C. Camy-Peyret, J. W. C. Johns, and B. Carli, J. Chem. Phys. 91, 1504 (1989).
Author Institution: "CNRS, Université Pierre et Marie Curie", Tour 13, bte 76, 4 Place Jussieu, F-75252 PARIS, Cedex 05, France; Institut der Justus Liebig Universitat, Heinrich Buff Ring 58, D-35392 Giessen Germany.; IROE-CNR, Via Panciatichi, 64 - 50127 Firenze Italy; Adam Mickiewick University, 60-780 Poznam, Poland.

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