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Correlation effects in a two-electron atom

A new approach is given to the problem of a two-electron atom in the non-relativistic limit. Atomic 'quasi-particles', which are 'freer' than single electrons, are described by the substitution of variables which makes it possible to use perturbation theory. A high-energy absorption spectrum with the resulting emission and decay of a two-electron atom has been predicted. Generalisation of this method to the case of multi-electron atoms is discussed.