1. G. Mauckner, T. Walter, T. Baier, K. Thonke, R. Sauer, R. Houbertz, U. Memmert, and R.J. Behm:
   Luminescence properties and surface topography of porous silicon
   J. Lumin. 57, 211-215 (1993).
2. G. Beitel, K. Markert, J. Wiechers, J. Hrbek and R.J. Behm:
   Characterization of single crystal a-Al2O3(0001) and (1120) surfaces and Ag/Al2O3 model catalysts by atomic force microscopy
   in 'Adsorption on Ordered Surfaces of Ionic Solids and Thin Films', H.J. Freund and E. Umbach eds., p. 71-81 (Springer, Berlin, 1993).
3. F. Donig, A. Feltz, M. Kulakov, H.E. Hessel, U. Memmert, and R.J. Behm:
   Gas phase etching of Si(111) by molecular oxygen observed by scanning tunneling microscopy
   J. Vac. Sci. Technol. B11, 1955-1961 (1993).
4. J. Vrijmoeth, C. Günther, J. Schröder, R.Q. Hwang, and R.J. Behm:
   Morphology and structure of ultrathin Co and Au Films grown on Ru(0001) substrates
   in 'Magnetism and Structure in Systems of Reduced Dimensions', R.F.C. Farrow, B. Dieny, M. Donath, B.D. Hermsmeier, and A. Fert eds., p. 55-66 (Plenum, New York, 1993).
5. O.M. Magnussen, J. Hotlos, R.J. Behm, N. Batina, and D.M. Kolb:
   An in-situ scanning tunneling microscopy study of the electrochemically induced 'hex' <-> (1x1) transitions on Au(100)
   Surf. Sci. 296 , 310-332 (1993).
6. U. Neuwald, H.E. Hessel, A. Feltz, U.Memmert, and R.J. Behm:
   Wet chemical etching of Si(100) surfaces in concentrated NH4F solution: formation of (2x1)H reconstructed Si(100) terraces versus (111) facetting
   Surf. Sci. 296, L8-L14 (1993).
7. E. Hartmann, F. Koch and R.J. Behm:
   Formation of local, electrically active structures in amorphous silicon films by scanning tunneling microscopy
   in 'Atomic and Nanometer Scale Modification of Materials: Fundamentals and Applications', P. Avouris ed., p. 49-64 (Kluwer, Dordrecht, 1993).
8. H. Brune, J. Wintterlin, J. Trost, G. Ertl, J. Wiechers and R.J. Behm:
   Interaction of oxygen with Al(111) studied by scanning tunneling microscopy
   J. Chem. Phys. 99, 2128-2148 (1993).
9. G. Doyen, D. Drakova, J.V. Barth, R. Schuster, T. Gritsch, R.J. Behm, and G. Ertl:
   Scanning tunneling microscopy imaging of clean and alkali covered Cu(110) and Au(110) surfaces
   Phys. Rev. B 48, 1738-1749 (1993).
10. J.V. Barth, H. Brune, R. Schuster, G. Ertl and R.J. Behm:
    Intermixing and two-dimensional alloy formation in the Na/Au(111) system
    Surf. Sci. 292, L769-2148 (1993).
11. O. Magnussen and R.J. Behm:
    In-situ scanning tunneling microscopy observations of the potential dependent recon-struction on Au(110) in acidic electrolytes
    Surf. Sci. 289, 139-151 (1993).
12. R. Houbertz, U. Memmert, and R.J. Behm:
    Potential dependent etching of Si(111) surfaces in NH4F solutions studied by scanning tunneling microscopy
    Appl. Phys. Lett. 62, 2516-2518 (1993).
13. C. Günther, S. Günther, R.Q. Hwang, E. Kopatzki, S. Schröder, J. Vrijmoeth, and R.J. Behm:
    Microscopic aspects of thin metal film epitaxial growth on metallic surfaces
    Ber. Bunsenges. Phys. Chem. 97, 522-536 (1993).
14. E. Kopatzki, S. Günther, W. Nichtl-Pecher, and R.J. Behm:
    Homoepitaxial growth on Ni(100) and its modification by a preadsorbed oxygen adlayer
    Surf. Sci. 284, 155-166 (1993).