Abstract
The analysis of kinetic data on thermal donors (TDS) leads to a general model of oxygen aggregation: the aggregates which arise differ not only in size but also in the number of emitted self-interstitials, m. Each line of aggregates-of a particular m-may contain a TD family. The well known family of double donors observed in in absorption spectra is most likely to reside at m=2. This family is often a minor one in comparison with another family of double TDS which resides at m=1 and is characterized by somewhat shallower energy levels. Self-interstitials (SiIs) produced by aggregates have a strong effect on the TD generation as (i) the equilibrium concentration ratio between the adjacent lines depends on the SiI concentration, CI, and (ii) oxygen transport is sometimes enhanced by SiIs though oxygen attachment to the aggregates is often controlled not by monomer migration (enhanced or not) but by migration of the aggregates themselves. The dependence of generation rate on CI includes both rising and falling parts as well as plateaux (the classical fourth-power law is an example of such a plateau). The actual value of CI depends on the density of SiI sinks (self-interstitial clusters) which appears to be a most important parameter in the TD kinetics.
Published Version
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