Knowledge Bank

It should be possible in the near future to observe the band of $N2O5$ in the atmospheric window between 300 and 400 $cm-1$ in addition to monitoring the band at 1254 $cm-1$ which has been observed in the stratosphere. In view of this possibility, we have measured the spectrum of $N2O5$ between 250 and 600 $cm-1$ over the temperature range from room temperature to $600C$ at intervals of $100C$. The measurements were made at resolutions of both 0.1$cm-1$ and $0.01cm-1$. Spectra of the two major impurities, $NO2$ and $HNO3$, were run under the same conditions in order to compensate their contributions to the $N2O5$ spectra. Furthermore, a spectrum of $N2O5$ at a resolution of $0.002cm-1$ was run at $-600C$. These data are being evaluated in an effort to obtain accurate intensity information for the $N2O5$ absorption in this spectral range.