Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..870l&link_type=abstract
Astronomy and Astrophysics, v.302, p.870
Astronomy and Astrophysics
Astrophysics
26
Molecular Processes, Ism: Dust, Molecules, Clouds
Scientific paper
We have computed the chemical equilibrium state of dark interstellar clouds allowing for the influence of the grains. We find that the solutions of the chemical rate equations are bistable, as reported previously. If it is assumed that hydrogenation reactions occur rapidly on grain surfaces and saturated species are returned to the gas phase, the zone of bistability is restricted to low gas density n_H_=~10^2^cm^-3^. However, in this case, the fractional abundances of saturated species in the gas phase are unrealistically large. We point out that, if desorption occurs preferentially from the outer layers of grain mantles, the final (equilibrium) state of the gas must depend on the initial conditions.
Flower David R.
Le Bourlot Jacques
Pineau des Forêts Guillaume
Roueff Evelyne
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