The [NeIV] Lines in High Excitation Gaseous Nebulae.
The "forbidden" lines of three times ionized neon are among the most precious indicators of electron temperature and excitation. They are also predicted to be among the strongest lines observed in the far ultraviolet spectra of high excitation nebulae.
Aller
L H
LH
DEPARTMENT OF ASTRONOMY, UNIVERSITY OF CALIFORNIA (LOS ANGELES).