Transfert de nickel, de cuivre et de zinc lors de la manipulation de pièces de monnaie : le cas du dirham marocain

Fournier, P.; Nourtier, A.; Monkade, Mohamed; Berrada, Khalid; Boughaleb, H.; Outzourhit, A.; Pichon, Rémy; Haut, C.; Govers, T.R.

doi:10.1016/j.crhy.2006.03.011

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Air Oxidised Metals1

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2009

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“…Then the signal diminishes rapidly and the difference from the final value tends to follow a power law 1/tγ with γ ≈ 1.2. Such a law with γ a little more than unity is characteristic of a situation where one randomly collects items which are more and more difficult to collect as they become rarer [11]. The power law behaviour explains the difficulty of getting rid of the residual oxygen which the bombardment partly takes off and partly pushes into the target and which reacts with aluminium.…”

Section: Air Oxidised Metalsmentioning

confidence: 99%

Ion Beam Sputtering Monitored by Optical Spectroscopy

Fqih

Fournier

2009

Acta Phys. Pol. A

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Optical spectroscopy gives a simple means to follow the evolution of the surface composition during ion beam sputtering. This is illustrated by three examples: air oxidised metals (Al and Cu), various CuAl alloys and the Cu 98 Be 2 alloy. Several time scales are distinguished, corresponding to different processes: the elimination of surface contaminants, the removal of the corroded layer. The implications for the use of ion beam optical spectroscopy in surface analysis are discussed.

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Section: Air Oxidised Metalsmentioning

confidence: 99%