New Bistable Solutions in Molecular Cloud Chemistry: Nitrogen and Carbon Autocatalysis

We have investigated the chemistry of dense interstellar clouds and found new bistable solutions in nitrogen carbon chemistries. identify autocatalytic processes that are present pure, reduced, chemical networks and, as previously for oxygen chemistry, He$^+$ plays an important role. The applicability these results to astronomical environments is briefly discussed. occur low densities high ionization fractions not compatible with cold, clouds. Bistability pure occurs conditions relevant prestellar cores which significant CO depletion has taken place. conclude several autocatalyses embedded gas-phase many more potentially present.