An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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radiationless relaxation
  واهلش ِ بی‌تابش  
vâhaleš-e bitâbeš
Fr.: relaxation sans rayonnement  

A process in which a molecule relaxes without emitting a → photon.

See also: → radiation; → -less; → relaxation.