Difference between revisions of "Forbidden Line"
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Forbidden Line
</dt>
A line in a spectrum
resulting from a transition from a metastable
state within an atom. Forbidden lines are not found in ordinary sources, but
may be conspicuous in very large bodies of rarefied gas where the time
interval between collisions of atoms is long.
</dd>
'Forbidden lines of oxygen appear, for example, in the aurora.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
