Knowledge Bank

The absorption of $H2O2$ between 15 nd $150cm-1$ has been examined with a grating spectrometer (0.3 to $0.5cm-1$ resolution). The interpretation of most of the strong lines (a series of doublets) is consistent with that of Massey and $Bianco1$ for the microwave spectrum: that $H2O2$ is a nearly symmetric top with the K levels split by the hindered rotation potential barrier. The observed doublets aries from the transitions $\Delta K=1$ and $\Delta J=0$, and yield values of $9.19cm-1$ for (A--B). and $11.43cm-1$ for the average splitting of the K levels.