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Book Chapter

Theory of tunneling from transition metal tips


Doyen,  G.
Theory, Fritz Haber Institute, Max Planck Society;


Koetter,  Erich
Theory, Fritz Haber Institute, Max Planck Society;

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Doyen, G., Koetter, E., Barth, J., & Drakova, D. (1990). Theory of tunneling from transition metal tips. In R. J. Behm, N. Garcia, & H. Rohrer (Eds.), Scanning Tunneling Microscopy and Related Methods (pp. 97-111). Dordrecht: Springer.

Cite as: https://hdl.handle.net/21.11116/0000-0008-A1AA-2
A transition metal tip consisting of a single tungsten atom adsorbed on a W(llO) surface is modelled. Chemisorpion theory is applied to treat the interaction of the tip atom with the flat W(llO)-surface. The basis set on the tip atom includes 6s-, 6p- and 5d-orbitals. The importance of the d-electrons for the tunneling to an AI(111)-surface is investigated. Inclusion of the d-orbitals affects strongly the local electronic structure and modifies the current. For short distances a significant part of the total tunnel current flows directly via the tip d-orbitals. The theory is used to investigate the 'barrier height' of the clean surface. A corrugation of the AI(l11)-surface is obtained in STM-theory, if a elastic deformation of the tip is taken into account.