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Do purely electrostatic ion traps exist?

  1. Mar 17, 2014 #1
    I was wondering whether you could trap a cation simply by putting it inside a positively charged sphere. Is this possible?
     
  2. jcsd
  3. Mar 17, 2014 #2

    mfb

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    This is impossible, see Earnshaw's theorem. You can also use Gauß' law to get the same result for a single charge in an electric field.
     
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