Abstract: Absorption cross-sections for HNO$-3$/ and N$-2$/O$-5$/ have been measured in the wavelength region 220 - 450 nm, using a dual beam diode array spectrometer with a spectral resolution of 0.3 nm. The results for both compounds are in good agreement with recommended values at room temperature. Cross-sections of both HNO$-3$/ and N$-2$/O$-5$/ show a marked reduction with decreasing temperature in the range 295 - 233 K. !10
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