AVS 45th International Symposium
    Nanometer-scale Science and Technology Division Thursday Sessions
       Session NS-ThA

Paper NS-ThA5
Probe Induced Manipulation of Bromine, Iodine, and Sulfur on Si (100)

Thursday, November 5, 1998, 3:20 pm, Room 321/322/323

Session: Nanoscale Manipulation and Chemical Modification
Presenter: C.F. Herrmann, University of North Carolina, Chapel Hill
Authors: C.F. Herrmann, University of North Carolina, Chapel Hill
J.J. Boland, University of North Carolina, Chapel Hill
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Scanning tunneling microscopy was used to study probe induced manipulation of the chemisorption sites of molecules on the Si (100) 2x1 surface. Specifically, the behaviors of bromine, iodine, and sulfur were studied. These adsorbates initially adsorb to the room temperature surface on adjacent dimers of the same row. Using the probe tip, one of the atoms can then be shifted to another dimer in this row, leaving one or more bare Si dimers in between them. This relocation occurs due to an increase in the field between the probe tip and the Si surface, which is induced by applying a voltage pulse to the probe tip. The separation efficiency as a function of probe tip voltage was measured for each adsorbate and it was found that each adsorbate exhibited a different threshold voltage. The diatomic molecules can also adsorb to the surface along a single dimer unit. A comparison study of the behaviors of the two different adsorption configurations was also conducted.