Knowledge Bank

The purpose of this work was to obtain reliable absolute intensities for the $\nu 6$ band of $H2O2$. This work was undertaken because strong discrepancies exist between the different $\nu 6$ band intensities which are presently available in the $literatureab$. The method which was used in the present work is to use Fourier transform spectra of $H2O2$ recorded at Giessen in a spectral range $(370-1270cm-1)$ which covers both the R-branch of the torsion-rotation band at low wavenumber and the P-branch of the $\nu 6$ band at high wavenumber. $\bullet$ From the low wavenumber data, the partial pressure of $H2O2$ present in the cell during the recording of the spectra was determined by calibrating the observed absorptions in the torsion-rotation band with intensities computed *** by using the permanent $H2O2$ dipole moment measured by Stark $effectd$. $\bullet$ In the high frequency range, this value of the partial pressure of $H2O2$ was used to measure absolute line intensities in the $\nu 6$ band. Finally, the line intensities in the $\nu 6$ band were fitted using the theoretical methods described in detail in our previous $worksa,c$.