Fig. 2.
Conceptual model for distribution of S MIF in products of sulfur photochemistry. Arrows may represent complex, multistep reaction pathways rather than single reactions. S MIF in the photoproducts and in the residual SO2 are shown in red. At wavelengths less than ∼220 nm, SO2 dissociates and photoproducts are fractionated by a factor, ED. Photoexcitation at wavelengths greater than ∼260 nm and subsequent reaction of the excited SO2 may lead to a variety of final products. These photoproducts are fractionated by a different factor, E*. SO3 (and subsequently H2SO4) may form by direct oxidation of SO2, in which case the oxidation products will carry S MIF similar to the SO2. The fractions of H2SO4 and S8 formed by reaction of photoexcited SO2 are denoted 
and 
, respectively.