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A constant, 1.097 x 10⁷ m−¹, that appears in the formulae for the wave numbers of lines in atomic spectra and is a function of the rest mass and charge of the electron, the speed of light, and Planck's constant.
- ‘Five recent measurements of the frequencies of optical spectral lines in atomic hydrogen and deuterium have improved the accuracy of the Rydberg constant beyond 1 part in 109.’
- ‘Our aim is a measurement of the Rydberg constant, directly in frequency units, with an uncertainty of less than 10−10.’
Early 20th century: named after Johannes R. Rydberg (1854–1919), Swedish physicist.
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