An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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forbidden transition
  گذرش ِ بژکم  
gozareš-e bažkam
Fr.: transition interdite  

A transition between two quantum mechanical → states
that → violates the quantum mechanical → selection rules.

See also: → forbidden; → transition.