Fano Lineshapes Revisited: Symmetric Photoionization Peaks from Pure Continuum Excitation

Details Fano Lineshapes Revisited: Symmetric Photoionization Peaks from Pure Continuum Excitation Fano Lineshapes Revisited: Symmetric Photoionization Peaks from Pure Continuum Excitation

2003-06-16

arxiv.org/abs/cond-mat/0306420v1

Physical Review Letters 90 (2003) 233004

Physics

Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.233004

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

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