Abstract
The structure of the WB 2(0001) surface has been investigated using impact–collision Li + ion-scattering spectroscopy combined with three-dimensinal three-atom computer simulation. We found that a graphitic boron layer is formed on the WB 2(0001) surface, where the strong W 5d–B 2p orbital hybridization and/or charge transfer from tungsten to boron may be responsible for stabilization of the graphitic boron layer. It is also found that the scattered Li + ions lose a considerable amount of their kinetic energy due to electron–hole pair excitation when passing through the negatively charged boron layer. The electronic stopping power is explained qualitatively by the impact-parameter approximation proposed by Firsov. But consideration of the electronic shell effect or the formation of molecular orbitals is suggested to improve the agreement between experiment and theory.
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