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Secondary electron emmission from the entrance and exit surfaces of thin carbon foils under fast ion bombardment

Shi, C. R. and Toh, H. S. and Lo, D. and Livi, R. P. and Mendenhall, M. H. and Zhang, D. Z. and Tombrello, T. A. (1985) Secondary electron emmission from the entrance and exit surfaces of thin carbon foils under fast ion bombardment. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 9 (3). pp. 263-267. ISSN 0168-583X. http://resolver.caltech.edu/CaltechAUTHORS:20141104-101104543

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Abstract

The total secondary electron emission (SEE) yield from the entrance and exit surfaces of thin carbon foils under fast ion (^(16)O, ^(19)F, ^(35)Cl) bombardment has been measured as a function of the ion energy and the ion beam current intensity. Using a retarding field, the energy distribution of secondary electrons integrated over almost all angles of emission in the backward and forward directions has also been measured. It is found that total forward emission is larger than backward emission by factors of up to 2.5, 2.7 and 3.4 for ^(16)O^(+3), ^(19)F^(+3) and ^(35)Cl^(+5), respectively. It is suggested that the enhancement of forward SEE may be partly due to effects from the instantaneous charge state of the heavy ion beam in the solid in addition to the binary collisions of the projectile with individual electrons in the target. It is also shown that the total SEE yield from the entrance and exit surfaces of the target foils decreases with ion beam current intensity; this may be a beam-induced temperature effect. The total SEE yield in both the forward and backward directions is less sensitive to surface conditions for high velocity ions than for low velocity ions and the total yield from both surfaces of the foils is proportional to the ion stopping power in the target, where the constant of proportionality depends on the properties of material.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0168-583X(85)90749-9DOIArticle
http://www.sciencedirect.com/science/article/pii/0168583X85907499PublisherArticle
Additional Information:© Elsevier Science Publishers Received 16 November 1984 and in revised form 6 February 1985. Supported in part by the National Science Foundation (DMR83-18274).
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Funding AgencyGrant Number
NSFDMR83-18274
Record Number:CaltechAUTHORS:20141104-101104543
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141104-101104543
Official Citation:Shi, C. R., Toh, H. S., Lo, D., Livi, R. P., Mendenhall, M. H., Zhang, D. Z., & Tombrello, T. A. (1985). Secondary electron emission from the entrance and exit surfaces of thin carbon foils under fast ion bombardment. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 9(3), 263-269. doi: http://dx.doi.org/10.1016/0168-583X(85)90749-9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51220
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:04 Nov 2014 21:30
Last Modified:04 Nov 2014 21:30

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