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Expanding the Capabilities of the Scanning Tunneling Microscope

  • K.F. Kelly
  • Z.J. Donhauser
  • B.A. Mantooth
  • P.S. Weiss
Part of the NATO Science Series II: Mathematics, Physics and Chemistry book series (NAII, volume 186)

Abstract

Scanning probe microscopes allow unprecedented views of surfaces and the site-specific interactions and dynamics of adsorbates. Our efforts to identify and to characterize atoms and molecules on surfaces and how it is that the scanning tunneling microscope images these surfaces and adsorbates will be discussed. We have extended the capabilities of scanning probe microscopes in several ways; two in particular will be highlighted. In the first section, recent advances in tunable microwave frequency scanning tunneling microscopy (STM) allow dopant profiling at unprecedented resolution will be presented. We apply nonlinear tunable microwave frequency scanning tunneling microscopy and spectroscopy to profiling dopants at ultrahigh resolution in semiconductors that is sensitive to both dopant type and density. We are then able to use a spectroscopic imaging mode to map the dopant density at the atomic scale. In the second part of this chapter, advanced image processing techniques that extend the scientific capabilities of STM will be presented. A digital image tracking algorithm based on Fourier-transform crosscorrelation has been developed to correct for instrumental drift in scanning tunneling microscope images. This tracking algorithm was used to monitor conductance changes associated with different conformations in conjugated switching molecules and to trace the diffusion of individual benzene molecules on silver.

Keywords

Dopant Profile Drift Track Scanning Capacitance Microscope Trac King Switch Molecule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2005

Authors and Affiliations

  • K.F. Kelly
    • 1
    • 2
  • Z.J. Donhauser
    • 1
  • B.A. Mantooth
    • 1
  • P.S. Weiss
    • 1
  1. 1.Departments of Chemistry and PhysicsThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Electrical EngineeringRice UniversityHoustonUSA

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