Abstract
Tracer techniques are still the dominant experimental approach to the microscopic mechanisms of atomic transport /1/. In today’s “state of the art”, however, in order to extract reliable new information from diffusion measurements one requires a precision considerably above that furnished by conventional instrumentation a decade ago. During recent years, the technique of SIMS has proven its particular usefulness in this freld /2,3/. The tasks include the delineation of very slight curvatures in the Arrhenius plot of diffusion /4,5/. Even higher requirements apply in measurements of the isotope effect of diffusion /1,3/, potentially a very powerful technique for pinpointing atomic mechanisms of diffusion /6,7/. With increasing sophistication of such applications, however, several particular artifacts of SIMS have emerged as non-negligible obstacles. The present paper attempts to discuss the following factors in the evaluation, from in-depth profiles, of diffusion coefficients and particularly of their isotope mass dependence:
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a)
Counting dead-time
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b)
Assignment of correct time coordinate at each peak count
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c)
Geometry of diffusion profile
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d)
Determination of effective position of specimen surface, x=0 in the profile.
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References
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© 1984 Springer-Verlag Berlin Heidelberg
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Odelius, H., Södervall, U. (1984). Aspects of SIMS Evaluation of Tracer Diffusion and Its Isotope Effect. In: Benninghoven, A., Okano, J., Shimizu, R., Werner, H.W. (eds) Secondary Ion Mass Spectrometry SIMS IV. Springer Series in Chemical Physics, vol 36. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82256-8_83
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DOI: https://doi.org/10.1007/978-3-642-82256-8_83
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