An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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bound-bound transition
  گذرش ِ بندیده-بندیده  
gozareš-e bandidé-bandidé
Fr.: transition liée-liée  

A transition between two energy levels of an electron bound to a nucleus. The electron remains tied to the nucleus before and after the transition. → bound-free transition; → free-free emission.

See also: Bound, p.p. of → bind; → transition.