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" Averaged over 5-nm intervals centered on the wavelength shown.

6 From Harwood and Jones (1994).

" Averaged over 5-nm intervals centered on the wavelength shown.

6 From Harwood and Jones (1994).

under some conditions, especially high concentrations and lower temperatures. In other cases, it is not a problem. For example, the reaction of hydrogen atoms with N02 is used as a source of OH in fast flow discharge systems. The reservoir holding NOz is often at relatively high concentrations and contains significant amounts of N204. However, the equilibrium (11, — 11) shifts sufficiently rapidly that the N204 dissociates to form N02 so that the initial presence of N204 is not a problem.

2. Photochemistry

Nitrogen dioxide photodissociates at A < 420 nm to give nitric oxide and an oxygen atom:

The quantum yield for oxygen atom production in (12) has been studied extensively because of its role as the only significant anthropogenic source of 03 in the troposphere via (12) followed by (2):

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