By allowing the positive ions to pass through an electric field and thus giving them a certain velocity it is possible to distinguish them from the neutral stationary atoms.
I realize I will always be the poster child for police brutality but I can try to use that as a positive force for healing and restraint.
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We can in fact first place the beam of rays of moving positive atomic ions in a plane perpendicular to the axis in which we see the spectral lines emitted by them.
