Berlin 2001 – scientific programme
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.28: Poster
Thursday, April 5, 2001, 12:30–15:00, AT3
SYSTEMATIC STUDY OF AUGER DECAY IN HOLLOW ATOMS — •Nathalie Vaeck1, Nourédine Zitane1, Pascal Quinet2,3, and Patrick Palmeri3 — 1Laboratoire de Chimie Physique Moléculaire, ULB, Belgium — 2IPNAS, Université de Liège, Belgium — 3Astrophysique et Spectroscopie, UMH, Belgium
Hollow atoms are characterized by a large number of vacant inner
shells and electrons occupying the outer shells. These ’exotic’ atomic
species are formed in collision processes between highly-charged ions and
several types of targets such as atoms, molecules, solid surfaces and
clusters. In the present work, the general behaviour of the Auger rates of
hollow atoms for different types of configurations involving identical or
non-identical electrons is studied in order to extract simple rules for the
decay properties of these complex systems. For highly charged ions
neutralized with electrons in excited configurations, conventional
calculations (such as those using the atomic structure codes HFR, MCHF,
GRASP, ...) are generally out of reach. Therefore, we have developed a
global approach which allows to estimate the Auger rates for these ’exotic’
systems. When using this method in several simple cases (nitrogen, neon,
...), it has been possible to reproduce Hartree-Fock results with good
accuracy (within a few percent). Our new approach has also allowed us to
calculate lifetimes for some very complex configurations which cannot be
considered using atomic structure codes because of computer limitations.
Acknowledgements
PQ and PP are respectively Research
Associate and Postdoctoral Researcher of the Belgian National
Fund for Scientific Research (FNRS).