Nonequilibrium capture of impurities that completely block kinks during crystal growth

Some impurities cannot integrate into isolated kinks because they completely block the growth of to which adsorb. For this class impurity, we derive an equation for amount that incorporates a crystal during elementary step by assuming such impurity if and only it gets captured between kink antikink. We show concentration in increases monotonically with mother phase, but can vary non-monotonically both supersaturation phase density step. In contrast other capture mechanisms, find weakly adsorbed incorporate extent is independent when high. Irrespective conditions, limited upper bound determined density.