Fano Lineshapes Revisited: Symmetric Photoionization Peaks from Pure Continuum Excitation

Abstract

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.

4 pages, 3 figures

References in corpus (2)

• Fano Resonances in Electronic Transport through a Single Electron Transistor
• Statistical Properties of Fano Resonances in Atomic and Molecular Photoabsorption

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• Dual Fano and Lorentzian line profile poperties of autoionizing states