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Interstellar carbon chemistry in an oscillating ultraviolet field: rotating clump model

A model consisting of clumps of gaz rotating in an external ultraviolet field is investigated in relation to the chemistry of C + , C I and CO. A given volume element of the clump is effectively subjected to a periodic, sinusoidally oscillating ultraviolet radiation field. For clump sizes of 0.01 → 0.1 pc, rotating with velocities ∼ 1 km/s, it is shown that the carbon is continually recycled between C + and C I, never producting substantial amounts of CO, since the formation time of CO is slow relative to clump rotation periods.