Theodor V Ionescu (+ 1988) made remarkable discoveries in plasma physics, ionosphere physics, ion coupling electrons in dense plasmas, masers, magnetron amplifiers, and Zeeman effects related to controlled nuclear fusion and quantum emission mechanisms in hot plasmas
The Zeeman Effect refers to the splitting of the visible spectrum via magnets. This is only part of the exhibit; you had to look through a special lens to see the effect. On display at the Exploratorium in San Francisco, California.
Pieter Zeeman, The Nobel Prize in Physics "in recognition of the extraordinary service they rendered by their researches into the influence of magnetism upon radiation phenomena", atomic physics, quantum physics