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; however, Ettore Majorana was the first to discover this phenomenon. 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.

Fano

Fano [ˈfaːno] is a town and comune of the province of Pesaro and Urbino in the Marche region of Italy. It is a beach resort 12 kilometres (7 miles) southeast of Pesaro, located where the Via Flaminia reaches the Adriatic Sea. It is the third city in the region by population after Ancona and Pesaro.

History

An ancient town of Marche, it was known as Fanum Fortunae after a temple of Fortuna located there. Its first mention in history only dates from 49 BC, when Julius Caesar held it, along with Pisaurum and Ancona. Caesar Augustus established a colonia, and built a wall, some parts of which remain. In 2 AD Augustus also built an arch (which is still standing) at the entrance to the town.

In January 271, the Roman Army defeated the Alamanni in the Battle of Fano that took place on the banks of the Metauro river just inland of Fano.

Fano was destroyed by Vitiges' Ostrogoths in AD 538. It was rebuilt by the Byzantines, becoming the capital of the maritime Pentapolis ("Five Cities") that included also Rimini, Pesaro, Senigallia and Ancona. In 754 it was donated to the Popes by the Frank kings.

Fano (Gijón)

Fano is a parish of the municipality of Gijón / Xixón, in Asturias, Spain. In 2012, its population was 220. Located in the south-east of the municipality, Fano is a rural area which borders the municipality of Siero in the south, and with the district of Valdornón in the east.

Toponym comes from Latin Fanum, a kind of temples ancient romans built in pre-Roman cults sacred places. A Benedictine monastery existed in Fano from 12th to 17th centuries. Its front romanesque façade is nowadays part of the San Juan Evangelista de Fano church.

Villages and their neighbourhoods

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Coordinates: 43°27′18″N 5°37′33″W / 43.4551°N 5.6259°W / 43.4551; -5.6259

Fano (disambiguation)

Fano may refer to: