An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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permitted transition
  گذرش ِ پرزامیده  
gozareš-e parzâmidé
Fr.: transition permise  

A transition between two quantum mechanical states that does not violate the quantum mechanical selection rules.

See also: → permitted; → transition.