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The Effect of MASS in Electron-Solid Interactions and the Mystery of the “Heinrich Kink”

Published online by Cambridge University Press:  02 July 2020

J.J. Donovan  and
N.E. Pingitore jr.
J.J. Donovan
Affiliation:
Department of Geology & Geophysics, University of California, Berkeley, CA94720-4767
N.E. Pingitore jr.
Affiliation:
Department of Geological Sciences, The University of Texas at El Paso, El Paso, TX79968-0555
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Extract

Is average atomic mass or average atomic number more appropriate to describe backscattered electron (BSE) effects in electron-solid interactions? In electron microprobe literature, either one or both of the terms A and Z may be found utilized in various theoretical models to describe electron backscattering. Physical theory would seem to favor atomic number averaging, because backscattering ultimately represents an electromagnetic interaction between the electron and the nucleus. At this scale, mass and its associated property of gravity, is 10 times less powerful than the electromagnetic force. Nonetheless, some empirical results show a strong relation between atomic mass and electron scattering, thus endorsing mass averaging.

The periodic table presents an opportunity for distinguishing between these two influences: those pairs of elements for which an increase in Z yields a decrease in average A (e.g., Ar-39.95 and K-39.10; Co-58.93 and Ni-58.71; Te-127.60 and 1-126.90) due to natural isotope abundances.

Type
New Trends in Scanning Electron Microscopy and Microanalysis
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 250 - 251
Copyright
Copyright © Microscopy Society of America

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