An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Ritz combination principle
  پروز ِ میازش ِ ریتز  
parvaz-e miyâzeš-e Ritz
Fr.: principe de combinaison de Ritz  

An empirical rule discovered before the advent of quantum mechanics which states that it is possible to find pairs of spectral lines, which have the property that the sum of their wavenumbers is also an observed spectral line.

See also: Named after Walther Ritz (1878-1909), a Swiss theoretical physicist; → combination; → principle.