Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..847p&link_type=abstract
Astronomy and Astrophysics, v.337, p.847-858 (1998)
Astronomy and Astrophysics
Astrophysics
16
Molecular Processes, Dust, Extinction, Circumstellar Matter, Stars: Late-Type
Scientific paper
We present a new theoretical formulation of the nucleation process of solid particles from the gas phase with special emphasis on the effects of chemical non-equilibrium in the gas phase and thermal non-equilibrium between the gas and the clusters or dust grains. In the derivation of the nucleation rates from kinetic theory and from thermodynamic arguments thermal and chemical non-equilibrium are straightforwardly included. A hierarchy of expressions for the stationary nucleation rate is given, ranging from a system of equations, which determines the rate, to an approximate analytic expression in the case of a single dominating growth species, which requires only the time scales of the growth processes and the Gibb's free energy change for the formation of clusters.
Gauger A.
Patzer B. C. A.
Sedlmayr Erwin
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