An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rotational transition
  گذرش ِ چرخشی  
gozareš-e carxeši
Fr.: transition rotationnelle  

A slight change in the energy level of a molecule due to the rotation of its constituent atoms about their center of mass.

See also: → rotational; → transition.