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. 2016 May 16;37(1):57–80. doi: 10.1002/mas.21507

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© 2016 by The Authors. Mass Spectrometry Reviews published by Wiley Periodicals, Inc.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Photographic plate from JJ Thomson's original experiment into positive rays highlighting the presence of the Neon 22 isotope (Reprinted with permission from Maher, Jjunju, & Taylor, 2015 (copyright 2015, American Physical Society)).