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Lyman series

(Lyman lines)
(hydrogen series from electrons settling from n > 1 to n = 1)

The Lyman series is ultraviolet spectral lines (Lyman lines) of the hydrogen atom as an electron goes from state of excitation n = 2 or greater down to n = 1. It is named after Theodore Lyman. (As opposed, for example, to the Balmer series for n = 3 or greater down to n = 2.)

Rydberg formula:

1/wavelength = RH ( 1 - 1 / n2 )

RH is the Rydberg constant for hydrogen, 1.09737316 × 107m-1 = 13.6eV / hc

A photon at or shorter than the Lyman limit can ionize any hydrogen. Photons from stars that are shorter than this limit are called Lyman continuum photons or LyC photons. Such photons are likely to ionize any neutral hydrogen in clouds they pass through, whether the hydrogen is excited or not. Cases where photons, e.g., from a galaxy, avoid such absorption (Lyman continuum escape) are of research interest.

(Lyman,hydrogen,line series,lines,spectrum)
91.18nm3.3PHz14eVbeginLyman series
121.6nm2.5PHz10eVendLyman series

Referenced by:
atomic excitation
Balmer series
Balmer-break galaxy (BBG)
Bohr model
Brackett series
Gunn-Peterson trough
hydrogen (H)
Lyman-alpha emitter (LAE)
Lyman-break galaxy (LBG)
Lyman alpha (Ly-α)
Lyman-alpha forest
Paschen series
spectral line