Atomic electron transition
Atomic electron transition is a change of an electron from one energy level to another within an atom or  artificial atom. It appears 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.
Electron transitions cause the emission or absorption of
electromagnetic radiation in the form of quantized units called photons. Their statistics are Poissonian, and the time between jumps is exponentially distributed. The damping time constant (which ranges from  nanoseconds to a few seconds) relates to the natural, pressure, and field broadening of spectral lines. The larger the energy separation of the states between which the electron jumps, the shorter the wavelength of the photon emitted.
The observability of quantum jumps was predicted by
Hans Dehmelt in 1975, and they were first observed using trapped ions of mercury at NIST in 1986.
 See also References
^ Schombert, James.
"Quantum physics" University of Oregon Department of Physics
Vijay, R; Slichter, D. H; Siddiqi, I (2011). "Observation of Quantum Jumps in a Superconducting Artificial Atom". Physical Review Letters. 106 (11): 110502. arXiv: . 1009.2969 Bibcode: 2011PhRvL.106k0502V. doi: 10.1103/PhysRevLett.106.110502. PMID 21469850.
Observing the quantum jumps of light
Itano, W. M.; Bergquist, J. C.; Wineland, D. J. (2015). "Early observations of macroscopic quantum jumps in single atoms" (PDF). International Journal of Mass Spectrometry. 377: 403. Bibcode: 2015IJMSp.377..403I. doi: 10.1016/j.ijms.2014.07.005. External links
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