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PACS. 31.25.Jf -Electron correlation calculations for atoms and ions: excited states. PACS. 05.45.Mt -Quantum chaos; semiclassical methods. PACS. 31.15.Ar -Ab initio calculations. Abstract. -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 candoi:10.1209/epl/i2004-10474-0 fatcat:4y5sr4smm5g3tmn45dfps3fvny