(first line in the Lyman series)
Lyman alpha (Ly-α or Lyα)
is a hydrogen spectral line,
the first line in the Lyman series and
is a target of interest for astronomical observation.
It has a wavelength of 121.6 nm, in the extreme ultraviolet (EUV) range
(as is the whole Lyman series) and cannot be observed from
the ground unless considerably redshifted.
Among its uses is as a sign of star formation at long distances.
The term Lyman alpha also applies to corresponding
lines of any ion with just one electron.
For 4He and deuterium,
the wavelength is less than 1 nm different
than that of 1H.
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Referenced by pages:
Dark Energy Spectroscopic Instrument (DESI)
damped Lyman alpha absorber (DLA)
Lyman-alpha emitter (LAE)
Lunar Reconnaissance Orbiter (LRO)
Lyman series (L)
spectral line designation
star formation (SF)