Doppler broadening

Dopp·​ler broadening | \ˈdäplə(r)-\

Definition of Doppler broadening 

: a lack of sharpness in the spectrum lines of gases due to the Doppler effect of the random thermal motion of the molecules

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History and Etymology for Doppler broadening

after Christian J. Doppler †1853 Austrian physicist

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the figure or shape of a crescent moon

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