Abstract
The majority of models of the circumstellar envelopes surrounding AGB stars have concentrated on the outer regions (R > 100 R*) where the penetration of the interstellar UV field can initiate a complex photochemistry. These models use as input the abundances of parent species which are either set from observational data or from LTE abundances, which are valid in the photosphere, and which assume that the molecules pass through the inner layers of the envelope relatively unaffected. However IR observations show some species to have abundances which are considerably different from their LTE values suggesting that there are important processes occurring in the inner region.
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