Chemical species in the camp-chem module are gas- or aerosol-phase species that can participate in chemical or phase-transfer reactions in the mechanism. Each species must have a unique name (the same name cannot be used for a gas-phase species and an aerosol-phase species). Chemical species may be present either in the gas-phase or any number of aerosol phases. For example, an aerosol-phase chemical species may be present in an "organic" and an "aqueous" aerosol phase.

Chemical species data include physical constants and species-specific model parameters that are used during initialization to assemble reaction and sub-model data for use during solving. Note that chemical species data are only available during initialization, and when using MPI are not passed to child nodes. The primary node will, however, have access to data in the camp_camp_core::camp_core_t::chem_spec_data object for outputing model data (e.g., species names).

The input format for chemical species can be found here.