Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 183 - 189
Section Atomic and molecular physics
Published online 16 March 2005
Europhys. Lett., 70 (2), pp. 183-189 (2005)
DOI: 10.1209/epl/i2004-10474-0

Decay rates of planar helium

J. Madroñero1, P. Schlagheck2, L. Hilico3, 4, B. Grémaud3, D. Delande3 and A. Buchleitner1

1  Max-Planck-Institut für Physik komplexer Systeme Nöthnitzer Str. 38, D-01187 Dresden, Germany
2  Institut für Theoretische Physik, Universität Regensburg D-03040 Regensburg, Germany
3  Laboratoire Kastler Brossel - 4 place Jussieu F-75252 Paris Cedex 05, France
4  Université d'Evry Val d'Essonne - Bd F. Mitterrand F-91025 Evry Cedex, France

received 9 September 2004; accepted in final form 15 February 2005
published online 16 March 2005

We compare the autoionization rates of characteristic configurations of the doubly excited helium atom, in one, two and three dimensions. We find that the decay rates of the two-dimensional restriction are in quantitative agreement with those of the real physical system, whilst the one-dimensional model can underestimate the actual decay rates by orders of magnitude.

31.25.Jf - Electron correlation calculations for atoms and ions: excited states.
05.45.Mt - Quantum chaos; semiclassical methods.
31.15.Ar - Ab initio calculations.

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