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Displaying 1 - 25 of 94

Simple Connections in Alkali Adsorption

January 21, 2009
Author(s)
John William Gadzuk
Stimulated by recent two-photon photoemission spectroscopy and density functional theory (DFT) studies by Petek and coworkers, a retrospective look at some fundamentals in the theory of ionic alkali adsorption on metal surfaces is presented that provides a

Fundamental Atomic-Scale Issues/Processes Pertinent to Dynamics at Surfaces

February 11, 2008
Author(s)
John William Gadzuk
An introduction to some basic concepts and building blocks that facilitate the understanding of atomic scale dynamics at surfaces is presented. The focus is mainly towards processes defined in terms of both nuclear and electronic involvement. Reduction of

Scanning Tunneling Microscope - Web Page

November 1, 2006
Author(s)
Marilyn E. Jacox, John William Gadzuk
The scanning tunneling microscope [STM] is widely used in both industrial and fundamental research to obtain atomic-scale images of metal surfaces. It provides a three-dimensional profile of the surface which is very useful for characterizing surface

Transition From Direct Tunneling to Field Emission in Metal-Molecule-Metal Junctions

July 1, 2006
Author(s)
J M. Beebe, BongSoo Kim, John William Gadzuk, C D. Frisbie, James G. Kushmerick
Current-voltage measurements of metal-molecule-metal tunnel junctions formed from p-conjugated thiols exhibit an inflection point on a plot of ln(I/V2) against 1/V, consistent with a transition in tunneling barrier shape from trapezoidal to triangular. The

Phonon Broadening of Spectral Lines in Scanning Tunneling Spectroscopy

March 17, 2006
Author(s)
John William Gadzuk
The observation and interpretation of spectral lines associated with quasi-localized states in condensed matter systems has provided a rich source of information pertaining to the transient coupling of these states to their dynamic environment.1 While

Thermally Assisted Atom Transfer on Surfaces

February 1, 2006
Author(s)
John William Gadzuk
The low-temperature rates for site-to-site transfer of single atoms and molecules adsorbed on surfaces have been determined in recent scanning tunneling microscopy (STM) studies within the temperature regime where the dominant transfer mechanism changes

Laser-Excited Hot-Electron Induced Desorption

March 1, 2001
Author(s)
John William Gadzuk
The history and technical highlights leading up to and following the publication of a classic NIST publication on the theory and experiments involving optical-laser induced desorption of adsorbed NO from metal surfaces is presented.