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A: Atomphysik
A 10: Photoionisation II and Electron Correlation
A 10.5: Fachvortrag
Montag, 7. März 2005, 11:15–11:30, HU 3075
The role of configuration space dimension in helium — •Javier Madroñero1, Peter Schlagheck2, Laurent Hilico3, Benoît Grémaud3, Dominique Delande3, and Andreas Buchleitner1 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden — 2Institut für Theoretische Physik, Universität Regensburg — 3Laboratoire Kastler Brossel, Paris
Quantum states associated with two characteristic configurations of the three body Coulomb problem are identified in ab initio quantum calculations on helium confined to a one, two and three dimensional configuration space. We compare the autoionization rates of these states and find that the two dimensional restriction leads to results that are in quantitative agreement with those of the real physical system, whilst confinement of the nucleus and the two electrons to one single dimension can lead to a dramatic underestimation of the actual decay rates (by orders of magnitude).