98-728 Bach V., Froehlich J., Sigal I.M.
Spectral Analysis for Systems of Atoms and Molecules coupled to the Quantized Radiation Field (570K, Postscript) Nov 24, 98
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Abstract. We consider systems of static nuclei and electrons --atoms and molecules-- coupled to the quantized radiation field. The interactions between electrons and the soft modes of the quantized electromagnetic field are described by minimal coupling, p --> p - e A(x), where A(x) is the electromagnetic vector potential with an ultraviolet cutoff. If the interactions between the electrons and the quantized radiation field are turned off, the atom or molecule is assumed to have at least one bound state. We prove that, for sufficiently small values of the feinstructure constant alpha, the interacting system has a ground state corresponding to the bottom of its energy spectrum and that the excited states of the atom or molecule above the ground state turn into metastable states whose life-times we estimate. Furthermore the energy spectrum is absolutely continuous, except, perhaps, in a small interval above the ground state energy and around the threshold energies of the atom or molecule.

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