Definition of Paschen series in US English:

Paschen series

noun

Physics
  • A series of lines in the infrared spectrum of atomic hydrogen, between 1.88 and 0.82 micrometers.

    • ‘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.’
    • ‘The Paschen series describes transitions from a higher level down to n = 3.’

Origin

1920s: named after L. C. H. Friedrich Paschen (1865–1947), German physicist.

Pronunciation

Paschen series

/ˈpäSHən ˌsirēz/