Geodesic
Effective Hamiltonian method and spectrum of a two-electron atom
Teoretičeskaâ i matematičeskaâ fizika, Tome 72 (1987) no. 2, pp. 219-228 Cet article a éte moissonné depuis la source Math-Net.Ru

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Spectrum of the Rydberg series of helium atom and helium-like ions with one-electron excited much stronger than the other is calculated up to the quadrupoleaccuracy. The method used is based on an explicit construction of the effective Hamiltonian by means of unitary transformations. 
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A. A. Belov; V. L. Pokrovskii. Effective Hamiltonian method and spectrum of a two-electron atom. Teoretičeskaâ i matematičeskaâ fizika, Tome 72 (1987) no. 2, pp. 219-228. http://geodesic.mathdoc.fr/item/TMF_1987_72_2_a5/

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