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Photophysics of Polyatomic Species Ejection Following Uv Laser Ablation of Single Crystal Bi2Sr2Ca1Cu2O8†

Published online by Cambridge University Press:  25 February 2011

Lawrence Wiedeman ,
Hyun-Sook Kim  and
Henry Helvajian
Lawrence Wiedeman
Affiliation:
Mechanics and Materials Technology Center, The Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009
Hyun-Sook Kim
Affiliation:
Mechanics and Materials Technology Center, The Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009
Henry Helvajian*
Affiliation:
Mechanics and Materials Technology Center, The Aerospace Corporation, P.O. Box 92957, Los Angeles, California 90009
*
**Person to whom correspondence should be addressed
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Abstract

A series of experiments have been conducted which probe the origin of the polyatomic ions (e.g., Sr2O+, BiCu+) measured following the low fluence, pulsed UV laser irradiation of crystalline Bi2Sr2CaCu2O8 (BiSrCaCuO). The photoejection of polyatomic species presents a problem for the pulsed laser deposition (PLD) technique. The deposition of polyatomic products could limit epitaxial growth during thin film material processing. Our results indicate that the polyatomic species are not the consequence of a gas phase recombination, but are in fact directly produced. All experiments are done at laser fluences below that required for above surface plasma formation. As such, our results do not address the formation of large clusters within the dense plume in high fluence laser ablation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 236: Symposium B – Photons and Low Energy Particles in Surface Processing , 1991 , 479
Copyright
Copyright © Materials Research Society 1992

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Footnotes

*

National Academy of Science (NRC) Post Doctoral Fellow

†

Aerospace Sponsored Research Program

References

[1] Wiedeman, L., Kim, H-S., and Helvajian, H., “Laser Ablation-Mechanisms and Applications,” (Springer-Verlag, New York, NY, 1991).Google Scholar
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[4] Weston, R. E. Jr, and Schwartz, H. A., Chemical Kinetics, (Prentice-Hall, New Jersey, 1972).Google Scholar