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Astron. Astrophys. 348, 659-661 (1999)

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Research Note

K-photoionisation of atomic carbon: shake up processes

D. Petrini 1 and E.P. da Silva 2

1 Observatoire de la Côte d'Azur, Department G.D. Cassini, B.P. 229, F-06304 Nice Cedex 4, France (petrini@obs-nice.fr)
2 Departamento de Fsica, U.F.C., CP 6030, Fortaleza, Ceará, Brazil 60455-760 (euclimar@fisica.ufc.br)

Received 7 April 1999 / Accepted 16 June 1999

Abstract

We evaluate the shake up process in the K-photoionisation of atomic carbon, i.e. the 2s [FORMULA] 2p and 3s, and 2p [FORMULA] 3p shake up excitations, within the photon energy range 25 to 45 Ry. As in the atomic boron case, the 2s [FORMULA] 3s excitation is still relatively strong and due to configuration interaction effects dominates the 2p subshell excitation to 3p. The conjugate shake up 2s [FORMULA] 2p is 3% near 45 Ry, decreasing slowly as expected. This infers that the shake off process would lead mostly to terms related to the configurations 1s2s2p2 with a percentage of about 20%.

Key words: atomic data – atomic processes – line: formation

Send offprint requests to: D. Petrini

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© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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