An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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de-excitation
  فرو انگیزش  
foru-angizeš
Fr.: désexcitation  

Transition from an excited energy state to a lower energy level, as in spectral line formation or particle emission from an atomic nucleus.

See also: From → de- + → excitation.