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Related:

https://en.wikipedia.org/wiki/Stark_effect

https://en.wikipedia.org/wiki/Zeeman_effect

Anode ray aka "positive ray" aka "canal ray":

https://en.wikipedia.org/wiki/Anode_ray

https://en.wikipedia.org/wiki/Positron (aka "antielectron")

Paper: "Dual electromagnetism: helicity, spin, momentum and angular momentum":

https://iopscience.iop.org/article/10.1088/1367-2630/15/3/03...

>"The dual symmetry between electric and magnetic fields is an important intrinsic property of Maxwell equations in free space. This symmetry underlies the conservation of optical helicity and, as we show here, is closely related to the separation of spin and orbital degrees of freedom of light (the helicity flux coincides with the spin angular momentum)." [...]

>"This dual electromagnetism preserves the form of Maxwell equations, yields meaningful canonical energy–momentum and angular-momentum tensors, and ensures a self-consistent separation of the spin and orbital degrees of freedom."