Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..337p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 337-340
Astronomy and Astrophysics
Astrophysics
3
Active Galactic Nuclei, Atomic Spectra, Auger Effect, Line Spectra, Neon, Photoionization, Space Plasmas, X Rays, Auger Spectroscopy, Cross Sections, Electron Transitions, Energy Levels, Molecular Excitation, Opacity
Scientific paper
1s-photoionization of atomic neon is accompanied by outer shell excitation and ionization. The simultaneous K and L electron ionization, which represents 16% of the single K electron ionization, produces Ne IV states by KL-LLL Auger decays. In astrophysical situations where a thin plasma is exposed to energetic photons, these Ne IV excited states give rise to soft X-ray lines with intensities of the same order of magnitude as the main Ne III lines resulting from the 1s2s22p6 K-LL Auger decay. Experimental and theoretical data on Auger and radiative rates, allow us to estimate some Ne II, Ne III and Ne IV relative soft X-ray line intensities (350-600 A).
Farias G. A.
Petrini D.
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