Langmuir states
In quantum mechanics Langmuir states are certain quantum states of Helium that in the classical limit correspond to two parallel circular orbits of electrons one above the other and with the nucleus in between. They are constructed in analogy to circular states of Hydrogen when the 
electron has the maximum angular momentum and moves on the circle. Because of the magic value of the Helium nucleus charge  2e the triangle nucleus-electron-electron which sweeps the configuration space during the circular motion  is equilateral.

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Quantum mechanics