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Surfaces of BaF 2 and SrF 2 prepared by cleavage along (111) planes in ultra-high vacuum were investigated with a dynamic scanning force microscope operated in the constant frequency detuning mode. We observe an atomic corrugation of some 10 pm on terraces and demonstrate that individual ions and vacancies can be resolved at step edges. Step edges do not necessarily follow low index...
We investigate the electronic and geometric structure of CaF 2 (111) surfaces produced by cleavage in air in comparison to surfaces cleaved in an ultra-high vacuum. An analysis with ultraviolet photoelectron spectroscopy reveals a broadening of the fluorine 2p valence band peak, the formation of a broad band of occupied electronic states extending into the band gap and an increase in electron...
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