2005/05/29 | Lyman Limit
类别(¤〖天文〗) | 评论(0) | 阅读(64) | 发表于 14:15
An electronic transition from level to in a hydrogen atom emits a photon of wavelength

where is the Rydberg constant. At all wavelengths shorter than that corresponding to the to electronic transition of the hydrogen atom, 912Å, photons ionize hydrogen and are absorbed. Galactic space is therefore opaque at wavelengths shorter than the Lyman limit.
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