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Materials Characterization with Intense Positron Beams

Published online by Cambridge University Press:  22 February 2011

I. J. Rosenberg,
R. H. Howell,
M. J. Fluss and
P. Meyer
I. J. Rosenberg
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
R. H. Howell
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
M. J. Fluss
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
P. Meyer
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

We have developed an apparatus that provides a high flux, low energy, monoenergetic positron beam to investigate various processes which occur when a positron beam impinges on a metal surface, including annihilation at the surface, trapping in vacancies, and the emission of both fast and thermally desorbed positronium. We report here the first angular correlation of annihilation gamma-rays measurements and positronium time of flight experiments at a material surface. We applied a simple free electron model which explains the general trend of the data but differences due to the surface specific properties and the deviation from a free electron metal are evident.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 48: Symposium E – Applied Materials Characterization , 1985, 419
Copyright
Copyright © Materials Research Society 1985

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References

REFERENCES

1. For a comprehensive review of positron beam measurements, see Positron Solid-State Physics, edited by Brandt, W. and Dupasquier, A., (North Holland, New York, 1983) and Positron Annihilation, edited by Paul G. Coleman, Suresh C. Sharma, and Leonard M. Diana (North Holland, New York, 1982).Google Scholar
2. Howell, R.H., Alvarez, R.A., and Stanek, M., Appl. Phys. Lett. 40, 751 (1982).Google Scholar
3. Pendry, J. B., in Positron Solid-State Physihs, edited by Brandt, W. and Dupasquier, A., (North Holland, New York, 1983), p. 408, and private communication.Google Scholar
4. West, R.N., Mayers, J., and Walters, P.A., J. Phys. E 14, 478 (1981).Google Scholar
5. Howell, R.H., Meyer, P., Rosenberg, l.J., and Fluss, M.J., Phys. Rev. Lett. 54, 1698 (1985).Google Scholar
6. Berko, S., Haghgooie, M., and Mader, J.J., Phys. Lett. 63A, 335 (1977).Google Scholar
7. Sueoka, O., J. Phys. Soc. Jpn. 36, 464 (1974).Google Scholar
8. Alam, A., Walters, P.A., West, R.N., and McGervey, J.D., J. Phys. F 14, 761 (1984) and R.N. West (private communication).Google Scholar
9. Mills, A.P. Jr., Pfeiffer, L., and Platzman, P.M., Phys. Rev. Lett. 51, 1085 (1983).Google Scholar