Abstract
The conditions of the runaway nucleation onset and the time evolution of the cluster distribution function are studied. The nucleation diagram is discussed in connection with a kinetically defined nucleation threshold. The kinetics of the runaway nucleation is described in terms of an asymptotically exact self-similar solution for transient nucleation stage. The observable cluster production rate as well as the time-dependent nucleation flux are found. It is shown that new `similarity' solution provides most adequate description (as compared with conventional theories) of the transient nucleation kinetics in the case of low nucleation barrier.
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