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Mechanisms of Excimer Laser induced Positive Ion Emission From Ionic Crystals

Published online by Cambridge University Press:  21 February 2011

J. T. Dickinson ,
J-J. Shin  and
S. C. Langford
J. T. Dickinson
Affiliation:
Department of Physics, Washington State University, Pullman, WA 99164-2814
J-J. Shin
Affiliation:
Department of Physics, Washington State University, Pullman, WA 99164-2814
S. C. Langford
Affiliation:
Department of Physics, Washington State University, Pullman, WA 99164-2814
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Abstract

The energy distributions of positive ions produced by exposing single-crystal MgO to pulsed 248 nm excimer laser light at fluences of 200-1200 mJ/cm2 were determined by combined quadrupole mass spectrometry and time-of-flight techniques. the dominant ionic species is Mg+, although small amounts of Mg2+, MgO+, and Mg2O+ are also observed. IN particular, the

Mg+ and Mg2+ energy distributions each show two broad peaks, with the energies of the Mg2+ peaks at significantly higher energies. Ion trajectory simulations (accounting for Coulomb forces only and assuming no surface relaxation) suggest that Mg2+ adsorbed at sites directly atop surface F-centers (oxygen vacancies with two trapped electrons) would be ejected upon photo-ionization of the F-center. the experimentally observed Mg2+ kinetic energies agree well with the energies predicted by the simulation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 388: Symposium Q – Film Synthesis and Growth Using Energetic Beams , 1995 , 15
Copyright
Copyright © Materials Research Society 1995

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