On the sulfur depletion: a more complete gas/grain astrochemical model
Despite being one of the most abundant elements in the universe, the interstellar chemistry of sulfur remains relatively poorly understood. It is known to be depleted during the early evolution of interstellar clouds, but the exact forms in which it may be found is far from certain. In the hopes of shedding some light on the question of sulfur depletion, we have significantly expanded the gas/grain astrochemical network of sulfur compounds based on the chemical literature. This updated chemical network has then been tested with a variety of physical models of clouds that range in evolution from diffuse clouds to dense cores. We present here some of the ongoing results from the models, and suggest plausible targets for astronomical observation or additional laboratory spectroscopy.