Peroxynitric Acid

Peroxynitric acid (H02N02) is a relatively unstable species that is important as a reservoir for N02 at lower temperatures via the reversible reaction (16, -16):

TABLE 4.14 Recommended Absorption Cross Sections (Base e) for Gaseous H02N02a ho2no2 <-> ho2

Figure 4.15 and Table 4.14 give the absorption cross sections. They do not show a significant temperature dependence down to 253 K (Singer et al., 1989).

There are a variety of potential photodissociation pathways, including the following:

ho2no2

hv -> H02 -

h no2,

(17a)

-> HO2 -

h NO + O,

(17b)

-> OH + N02 + O,

(17c)

-> OH + NO + 02,

(17d)

-> OH + N03.

(17e)

210 240 270 300 Wavelength (nm)

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