The results of a photoemission study of the surface core-level shift of the Pb 5d level in the semiconductor PbS are reported. We found no surface shift within an experimental error of ±{}0.1 eV. Since this compound is highly ionic, this result is inconsistent with the theory that ionicity determines surface core-level shifts. However, the shift may be used to show that the heat of segregation of Bi in PbS is zero.
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Paolucci et al. (1990) studied this question.
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