secondary spectrum


Definition of secondary spectrum

  1. 1 :  the spectrum of an element in the molecular state as distinct from its atomic line spectrum

  2. 2 :  residual dispersion by a lens that has been corrected as far as possible for chromatic aberration

  3. 3 :  the fainter of the two superimposed spectra of a spectroscopic binary star

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a rounded knoll or a ridge of ice

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