Picture 2. SPIEGELINGEN (Dutch) => REFLECTIONS (English)
Pic.2a: Emission of a photon (dotted line) by a counter-clockwise spinning electron (fixed line).
Pic.2b: Emission of a photon by a clockwise spinning electron.
Pic.2c: Absorption of a photon by a counter-clockwise spinning positron.
Pic.2d: Absorption of a photon by a clockwise spinning positron..
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