Electron-stimulated desorption of atomic oxygen from polycrystalline Ag |
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| Institution: | 1. Treibacher Industrie AG, Auer-von-Welsbach-Straße 1, A-9330 Althofen, Austria;2. Vienna University of Technology, Getreidemarkt 9/164CT, A-1060 Vienna, Austria;1. Xiamen Key Laboratory for Feed Quality Testing and Safety, College of Fisheries, Jimei University, Xiamen 361021, China;2. College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: | Emission of neutral oxygen atoms from an oxygen-charged polycrystalline Ag wire has been examined by using electron-stimulated desorption (ESD) in conjunction with threshold ionization detection (appearance potential). A quadrupole mass spectrometer (QMS) was used to detect the neutral oxygen atoms, but the ionizer was operated in the appearance potential (AP) mode to make it possible to distinguish the oxygen atoms from products formed by collision of the oxygen atoms with the walls. Loss of the reactive oxygen atoms was also minimized by enclosing the ESD chamber in fused silica. With a primary beam energy of 100 eV, the ESD cross section for oxygen atom desorption was found to be 7 × 10-19cm2 at 100 °C, and an ESD threshold was found to exist below 34 eV. Flash desorption of oxygen allowed estimation of the bulk diffusivity of oxygen through polycrystalline Ag. A value of 2.64 × 10-6cm2s-1 at 500 °C was obtained. |
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