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The work is devoted to the adaptation of the results of laboratory studies ofthe laser-induced dissociation of molecules of benzene adsorbed on a quartzsubstrate to the conditions of the interstellar medium. Adsorption wasperformed under conditions of low temperature and deep vacuum. The differencebetween the photolysis of adsorbed molecules and molecules in the gas phase isidentified. Significance of process of photolytic desorption in theinterstellar conditions is analyzed, in particular, in the conditions ofphotodissociation regions. It is shown that the efficiency and dissociationchannels of photolysis of adsorbed and gas phase benzene differ substantially.It is concluded that the photolysis of aromatic hydrocarbons adsorbed on theinterstellar dust grains contributes a negligible fraction to the abundance ofsmall hydrocarbons in the interstellar medium.

The Photolysis of Aromatic Hydrocarbons Adsorbed on the Surfaces of Cosmic Dust Grains