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2005/05/29 | Lyman Limit
类别(¤〖天文〗)
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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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