Nitrogen Trioxide NO3 , Dinitrogen Pentoxide

Nitrogen trioxide (NO3) is also called nitrate radical, and is formed by the reaction of O3 + NO2. Dinitrogen pentoxide (N2O5) is then formed from the NO3 and NO2 in the equilibrium reaction of NO3 + NO2 NiOs. The NO3 and N2O5 are important intermediates in nighttime chemistry, and their daytime concentrations are very low since NO3 absorbs solar radiation strongly and is easily photolyzed. 

The absorption cross section at 662 nm has been used for obtaining the concentration of NO3 in its detection in the laboratory and ambient air, and many laboratory studies have been conducted to obtain the value. The recommended 

The absorption cross sections of NO3 averaged over 1 nm intervals recommended by NASA/JPL Evaluation No. 17 (Sander et al. 2011) are given in Table 4.9. These values are based on the data by Sander (1986) that were normalized by the value at 662 nm mentioned above. 

Photolysis Quantum Yields of NO3 The two reaction pathways of the photolysis of NO3 in the visible region can be, 

Furthermore, as judged from the high resolution spectrum, the dissociation lifetime of the excited state of NO3 for the bands at wavelengths longer than 600 nm where sharp vibration-rotation structure is observed, is long and the observation of fluorescence has been known from the laboratory studies, 

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