Angle resolved photoemission studies have been carried out for the (110) cleaved surface of indium phosphide, using He I radiation (21.2 eV) as the light source. The angular dependence of the various features observed are considered in terms of emission from surface and bulk electron states. Many of the emission peaks can be understood in terms of k-conserving bulk optical transitions. In as much as emission may be attributed to surface states then the bond rotation-relaxation model of surface relaxation is to be preferred to the bond-relaxation model.
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McKinley et al. (1980) studied this question.
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