Abstract
In a recent paper, Yi and Neumark [Phys. Rev. B 48, 17 043 (1993)] determined the effective radii of donors and acceptors in ZnSe:Na from the time decay of the close pairs. The pair decay rate used is proportional to an overlap integral between donor and acceptor wave functions. We show that such an integral as well as the hopping matrix can be used for both donor-acceptor and donor-donor systems. The density of states, calculated from these integrals, is capable of predicting the shift of conductivities observed in experimental results. The calculation for the metal-nonmetal transition of Si: P,B is in good agreement with recent experimental findings.
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