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Wikipedia definition
1. Atomic electron transitionAtomic electron transition is a change of an electron from one quantum state to another within an atom or artificial atom. It appears to be discontinuous as the electron "jumps" from one energy level to another in a few nanoseconds or less. It is also known as atomic transition, quantum jump, or quantum leap. Quantum leaps cause the emission or absorption of electromagnetic radiation in the form of quantized units called photons.
Read “Atomic electron transition” on English Wikipedia
Read “量子跳躍” on Japanese Wikipedia
Read “Atomic electron transition” on DBpedia

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