J. Phys. I France
Volume 5, Numéro 8, August 1995
Page(s) 949 - 961
DOI: 10.1051/jp1:1995175
J. Phys. I France 5 (1995) 949-961

Do Atomic Spectra Determine Energy Levels?

C. Billionnet

Centre de Physique Théorique, Ecole Polytechnique, 91128 Palaiseau Cedex, France

(Received 7 December 1994, received in final form 13 April 1995, accepted 18 April 1995)

We examine the question of attributing energies to atomic excited states, given experimental line shapes. It is underlined that poles of the resolvant operator are not determined by peaks in cross-sections. Moreover, in the scattering of one photon by an atom, resonance energies seem to depend on final products.

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