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The interference of a discrete autoionized state with a continuum gives rise to characteristically asymmetric peaks in excitation spectra. The earlier qualitative interpretation of this phenomenon is extended and revised. A theoretical formula is fitted to the shape of the 2s2p^1P resonance of He observed in the inelastic scattering of electrons. The fitting determines the parameters of the 2s2p^1P resonance as follows: E=60. 1 ev, 0. 04 ev, f2 to 410^-3. The theory is extended to the interaction of one discrete level with two or more continua and of a set of discrete levels with one continuum. The theory can also give the position and intensity shifts produced in a Rydberg series of discrete levels by interaction with a level of another configuration. The connection with the nuclear theory of resonance scattering is indicated.
U. Fano (Fri,) studied this question.