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# Paschen series

In physics, the Paschen series (also called Ritz-Paschen series) is the series of transitions and resulting emission lines of the hydrogen atom as an electron goes from n ≥ 4 to n = 3, where n refers to the principal quantum number of the electron. The transitions are named sequentially by Greek letter: n = 4 to n = 3 is called Paschen-alpha, 5 to 3 is Paschen-beta, 6 to 3 is Paschen-gamma, etc.

They are named after the Austro-German physicist Friedrich Paschen who first observed them in 1908.

Paschen series, in the infrared, measured lines with wavelengths (nm):

 n Wavelength (nm) 4 5 6 7 8 9 10 11 12 13 $\infty$ 1874.5 1281.4 1093.5 1004.6 954.3 922.6 901.2 886 874.8 866.2 820.1