TRANSIENT NUCLEATION ON INHOMOGENEOUS FOREIGN SUBSTRATE

Nucleation from the vapor phase on a foreign substrate with a low numb er of inhomogeneities is studied. Kinetic equations describing the 3D nucleation on active sites are solved numerically. It is shown that th e cluster flux (i.e., the rate of; formation of nuclei of a given size ) reaches some extremal value at certain time and then tends to zero a s time increases; In such a sense, formation of nuclei is a fully nons tationary process, in contrast to the standard nucleation theory. The total number of nuclei formed bn a unit surface reaches for a sufficie ntly long time some stationary value which is close to the number of n ucleation active sites. (C) 1998 American Institute of Physics.