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Displaying 26 - 50 of 94

Nonequilibrium Theory of Scanning Tunneling Spectroscopy via Adsorbate Resonances: Nonmagnetic and Kondo Impurities

February 1, 2001

Author(s)

M Plihal, John William Gadzuk

We report on a fully nonequilibrium theory of the scanning tunneling microscopy (STM) through resonances induced by impurity atoms adsorbed on metal surfaces. The theory takes into account the effect of the tunneling current and finite bias on the system

Resonance Tunneling of Field Emitted Electrons Through Adsorbates on Metal Surfaces

January 1, 2001

Author(s)

John William Gadzuk

The NBS involvement in the development of single atom electron spectroscopy at surfaces, as realized in field emission resonance tunneling and reported in the seminal paper by E.W. Plummer, J.W. Gadzuk and R.D. Young is described.

Excited States at Surfaces: Fano Profiles in STM Spectroscopy of Adsorbates

March 1, 2000

Author(s)

John William Gadzuk, M Plihal

The Fano-Anderson model for a discrete state embedded within a continuum is revisited within the context of excitation and decay processes which lead to some manifestations of Fano lineshape profiles. The phenomenon of resonance tunneling between an STM

Hot-Electron Femtochemistry at Surfaces: On the Role of Multiple Electron Processes in Desorption

January 1, 2000

Author(s)

John William Gadzuk

Aspects of molecular processes at surfaces due to sub-ps laser pulses of visible light are discussed here. Within the limits of the standard two-temperature model describing the temporatl evolution of fs laser-excited substrate electrons, a theoretical

Chris Ernie Earl Kuyatt - Obituary

January 1, 1999

Author(s)

Robert Celotta, John William Gadzuk, Cedric J. Powell

Intramolecular Dynamics due to Electron Transitions: From Photoelectron Spectroscopy to Femtochemistry

January 1, 1999

Author(s)

John William Gadzuk

A personal recollection of the coming-to-an-understanding of select spectroscopic and then chemical physics problems associated with atomic motion triggered by electronic transitions is given. The story starts with the initial stimulation provided by Dick

Breathing Mode Excitation in Near Harmonic Systems: Resonant Mass Capture, Desorption and Atoms in Optical Lattices

June 1, 1998

Author(s)

John William Gadzuk

The phenomenon of breathing mode excitation or bound state wave packet squeezing and spreading driven by a time-dependent oscillator frequency [due to either a transient force constant or mass] is considered here. An easily implemented theory of stimulated

Comments on Vibrational Dynamics of Low Frequency Adsorbate Motion

January 1, 1998

Author(s)

B N. Persson, John William Gadzuk

We discuss the temperature dependence of the electronic damping of adsorbate vibrations, as probed by pump-and-probe and infrared spectroscopy. Incontrast to recent suggestions, we show that the damping is strictly temperature independent as long as the

UV Photoemission for Rare Gases Implanted in Ge

August 21, 1978

Author(s)

B Waclawski, John William Gadzuk, J F. Herbst

The first ultraviolet photoemission spectra of the valence electrons of rare-gas atoms, implanted by ion bombardment into an amorphous Ge matrix, are presented here. The positions of the peaks in the observed spectra are shifted relative to gas-phase

High Resolution Photoemission Study of Condensed Layers of Nitrogen and Carbon Monoxide

February 1, 1978

Author(s)

P R. Norton, R L. Tapping, H P. Broida, John William Gadzuk, B Waclawski

Values are reported for the absolute yields of KVV Auger electrons from beryllium and L 23VV Auger electrons from aluminum excited by 60- to 220-keV proton bombardment. The measurements were made using semi-infinite evaporated samples, and the results were

Many-body Effects in Photoemission

January 1, 1978

Author(s)

John William Gadzuk

Surface Relaxation Energies in Core Level Spectroscopies of Adsorbed Atoms and Molecules

October 1, 1977

Author(s)

John William Gadzuk

Core level holes which are created in electron emission spectroscopies of atoms and molecules adsorbed or condensed onto metal surfaces induce a screening charge at the surface. The Coulomb interaction between the induced and the hole charge, called the

X-Ray Photoemission Spectra from Adsorbed Layers on Metal Substrates

September 1, 1977

Author(s)

John William Gadzuk