Picture 4.    ROTATIES (Dutch) => ROTATIONS (English)

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Pic.4a: Emissie of a photon (dotted line) by a left-handed electron (fixed line).

Pic.4b: Annihilation of a left-handed electron and right-handed positron under emission of a photon.

Pic.4c: Absorption of an anti foton by a  right-handed positron. An incoming anti foton (indicated with a hyphen above the symbol) is equivalent with an incoming photon. There is no distinction between photon and antifoton.

Pic.4d: Creation of an electron and a positron by an (anti)foton.

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