Core-level spectroscopic study of the evolution of the sulfur-passivated InP(001) surface during annealing

摘要: Core-level photoemission spectroscopy and theoretical predictions of structure spectra are used to study the fully S-covered InP(001) surface its evolution during annealing. The theory predicts a number stable structures besides lowest-energy ground state which is (2{times}2)-reconstructed structure, where has two types S atoms. On annealing, fascinating sequence unfolds from as other become energetically accessible. atoms exchange with bulk P on forming new strong S{endash}P bonds while dissociating preexisting S{endash}S dimers. tilted just above there only one type atom in structure. measured excitation energies agree core-level for (2{times}2) reconstruction partial coverages. We conclude that annealed around 700 K most likely be reconstructed cell containing bonds, atom. {copyright} {ital 1997} American Physical Society}