Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..327p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 327, 328.
Astronomy and Astrophysics
Astrophysics
4
Astrophysics, Atomic Energy Levels, Beryllium, Ground State, Lithium, Metal Ions, Autoionization, Carbon, Electron States, Oxygen Ions, Photoionization
Scientific paper
Recent laboratory experiments have shown that the radiationless decay of Be(1s 2s2 np 1P0) is more likely to populate an excited level of Be(+) than the ground state. In view of the possible astrophysical importance of this process, calculations have been carried out to ascertain whether it applies to beryllium-like carbon and oxygen ions. Theoretical Auger rates for producing lithiumlike carbon and oxygen in the 2s, 2p and 3p states after autoionization of C(2+) and O(4+) follow a similar pattern to the experimental ones for Be and it is concluded that the dominant decay path for the doubly excited states 1s 2s2 np (n = 2, 3) of Be-like ions, following ejection of an Auger electron, is the one which leaves the residual Li-like ion in an excited 2p or 3p state. An important consequence is that inner-shell excitation of a Be-like ion (or K-shell ionization of a B-like ion) followed by Auger decay can be an efficient mechanism for populating excited states of helium-like ions.
Petrini D.
Tully John A.
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