Concept information
Preferred term
H-alpha line
Definition(s)
- H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air and 656.46 nm in vacuum; it occurs when a hydrogen electron falls from its third to second lowest energy level. H-alpha light is the brightest hydrogen line in the visible spectral range. It is important to astronomers as it is emitted by many emission nebulae and can be used to observe features in the Sun's atmosphere, including solar prominences and the chromosphere. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/H-alpha)
Broader concept(s)
Synonym(s)
- Hα line
In other languages
-
French
-
raie H α
-
raie Hα
URI
http://data.loterre.fr/ark:/67375/MDL-KNQW676S-W
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