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ion trap

noun, Physics.
1.
any device used to prevent ions in an electron beam from striking other apparatus, especially in mass spectrometry.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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ion-trap in Science
ion trap  
A device, such as a magnet, used to prevent ions in an electron beam from striking another apparatus, such as a cathode-ray tube screen, which could cause it to lose luminescence.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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