ion trap

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noun Physics.

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. 2013.
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Link To ion trap

American Heritage

Science Dictionary

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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00:10

Ion trap is always a great word to know.

So is doohickey. Does it mean:

a stew of meat, vegetables, potatoes, etc.

a gadget; dingus; thingumbob.

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