HOx Chemistry

Question 1

Sources of HOx in Troposphere (4)

Answer 1

1) Photodissociation of O3
O3 + hv → O2 + O(1D)
O(1D) + H2O → 2 OH⋅

2) Photodissociation of
HONO and H2O2
HONO + hv → OH⋅ + NO
H2O2 + hv → OH⋅ + OH⋅

4) Alkene oxidation
R1CH=CHR2 + O3 → OH⋅ +
prod.

5) From HO2⋅
– NO + HO2⋅ → NO2 + OH⋅