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In a photoionization spectrum in which there is no excitation of the discretestates, but only the underlying continuum, we have observed resonances whichappear as symmetric peaks, not the commonly expected window resonances.Furthermore, since the excitation to the unperturbed continuum vanishes, thecross section expected from Fano's configuration interaction theory isidentically zero. This shortcoming is removed by the explicit introduction ofthe phase shifted continuum, which demonstrates that the shape of a resonance,by itself, provides no information about the relative excitation amplitudes tothe discrete state and the continuum.Comment: 4 pages, 3 figure

Fano Line Shapes Reconsidered: Symmetric Photoionization Peaks from Pure Continuum Excitation