One of the mysteries of the English language finally explained.
A series of lines in the infrared spectrum of atomic hydrogen, between 1.88 and 0.82 micrometers.
- ‘The Paschen series describes transitions from a higher level down to n = 3.’
- ‘See a 1922 paper by Frederick Brackett comparing Bohr's formula for the hydrogen spectral series with the Paschen series and with two members of a new series.’
1920s: named after L. C. H. Friedrich Paschen (1865–1947), German physicist.
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