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Fano resonance
In physics, a Fano resonance is a type of resonant scattering phenomenon that gives rise to an asymmetric line-shape. Interference between a background and a resonant scattering process produces the asymmetric line-shape. It is named after Italian-American physicist Ugo Fano, who gave a theoretical explanation for the scattering line-shape of inelastic scattering of electrons from helium;〔" A. Bianconi (Ugo Fano and shape resonances ) in X-ray and Inner Shell Processes" AIP Conference Proceedings (2002): (19th Int. Conference Roma June 24–28, 2002) A. Bianconi arXiv: cond-mat/0211452 21 November 2002〕〔Ugo Fano (1961) "Effects of Configuration Interaction on Intensities and Phase Shifts," Phys. Rev. 124, pp. 1866–1878 〕 however, Ettore Majorana was the first to discover this phenomenon.〔Alessandra Vittorini-Orgeas, Antonio Bianconi ("From Majorana Theory of Atomic Autoionization to Feshbach Resonances in High Temperature Superconductors" ) Journal of Superconductivity and Novel Magnetism, 22, 215-221 (2009)〕 Because it is a general wave phenomenon, examples can be found across many areas of physics and engineering.
== History ==
The explanation of the Fano line-shape first appeared in the context of inelastic electron scattering by helium and autoionization. The incident electron doubly excites the atom to the state, a sort of shape resonance. The doubly excited atom spontaneously decays by ejecting one of the excited electrons. Fano showed that interference between the amplitude to simply scatter the incident electron and the amplitude to scatter via autoionization creates an asymmetric scattering line-shape around the autoionization energy with a line-width very close to the inverse of the autoionization lifetime.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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