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When A Mild Mannered 1-5 eV Photon Meets A Big 10 eV Bandgap: Studies Of Laser Desorption From Modified Surfaces of Ionic Single Crystals

Published online by Cambridge University Press:  10 February 2011

J. Thomas Dickinson
Affiliation:
Surface Dynamics Laboratory, Washington State University, Pullman, WA 99164-2814
Christos Bandis
Affiliation:
Surface Dynamics Laboratory, Washington State University, Pullman, WA 99164-2814
Stephen C. Langford
Affiliation:
Surface Dynamics Laboratory, Washington State University, Pullman, WA 99164-2814
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Abstract

Exposing wide-bandgap ionic materials to UV and IR photons can produce ion emissions with kinetic energies of several eV, well in excess of the photon energy. Electron emissions are also observed. This implies that these materials possess occupied electronic defect states within the band gap. We have investigated the consequences of a variety of defect-generating stimuli (electron irradiation, laser irradiation, mechanical treatments, and heating) on electron and ion emission from inorganic ionic crystals. These stimuli generate defects that strongly interact with the probe laser on a wide variety of ionic crystals, and dramatically decrease the probe laser intensities required for ion and neutral emissions, laser damage, and plume formation.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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