(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.
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 4helium or 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)
Lyman-alpha emitter (LAE)
Lunar Reconnaissance Orbiter (LRO)
Lyman series (L)
spectral line designation
star formation (SF)