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The problem of whether or not two oppesitely charged particles can form a bound state in the Coulomb field is considered, and it is found that the mass ratio of the heavier particle to the other must be more than 7.8 in order to give such a bound state. The InSb crystal is concluded to be capable of forming a bound state of an exciton at a positively charged imperfection since the mass ratio in such a case is ca. 15. (D.L.C.)
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Inokuti et al. (1960) studied this question.
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