The interaction potential between charged P vacancies on InP(110) surfaces is determined from scanning tunneling microscopy measurements of their correlation. It is found to have a functional form of a screened Coulomb potential except at very short distances. A vacancy charge of $+1e$ is derived from the measurements. The maximum repulsion is 65 meV and the range is 3 nm.
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Ebert et al. (1996) studied this question.
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