L-photoionization of atomic aluminium: production of Al II, Al III and Al IV UV lines

Details L-photoionization of atomic aluminium: production of Al II, Al III and Al IV UV lines L-photoionization of atomic aluminium: production of Al II, Al III and Al IV UV lines

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393.1081k&link_type=abstract

Astronomy and Astrophysics, v.393, p.1081-1087 (2002)

Astronomy and Astrophysics

Astrophysics

2

Atomic Data, Atomic Processes, Line: Formation

Scientific paper

Aluminium atoms undergoing soft X-ray irradiation produce multiply-ionized ions in excited states through inner-shell photoionization followed by radiationless transitions, i.e. Auger cascades. Photoionization of 2s-, 2p- and 3s subshells are considered for the 80 eV to 1 keV incident photon energy range. Photoionization cross sections, shake probabilities and Auger and Coster-Kronig rates are evaluated in various approximations. Al II, Al III, and Al IV UV lines are directly produced independently of local temperature and electron density. Monopole shake up/off and conjugate shake up excitations are important over a large energy interval beyond the L thresholds.

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