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- W2005529119 abstract "The Mg(0001) face is subjected to oxygen adsorption from 0 to 103 L. Three characteristic stages of oxygen adsorption are detected from 0 to 10 L. The AES signal of clean Mg decays exponentially against exposure with slopes α ai such that αA2 (0.75 → 3 L) >αA1 (0 → 0.75 L)>αA3 (3 → 10 L). For increasing exposures, they correspond to: (1) a clear (1 × 1)-Mg(0001), (2) a diffuse (1 × 1)-Mg(0001) and (3) a (1 × 1) with a weaker (1 × 1)-R30°-MgO(111) LEED patterns, respectively. At the end of the third stage, a supplementary (7 × 72)−R19°−MgO(111) pattern is observed. In ELS, a very fast intensity decrease of energy loss peaks due to surface and bulk plasmon excitations of the clean metal is recorded during the first stage. The energy loss peak due to the oxidized surface plasmon excitation reaches a maximum intensity at the end of the second stage. Energy loss peaks to be attributed to excitations in bulk MgO appear during the third stage. The work function of the sample decreases and shows a minimum around 6 L, and then slowly increases. Beyond 10 L, a logarithmic relation between oxide thickness and exposure seems to exist. These results are interpreted by the following sequential processes: stage 1: random oxygen chemisorption followed by oxygen incorporation (αA1); stage 2: assembling into islands and lateral island growth (αA2); stage 3: oxide formation (αA3) and stage 4: oxide thickening. Lattice models describing these processes are proposed and discussed. The influence of surface roughness on the results is emphasized." @default.
- W2005529119 created "2016-06-24" @default.
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- W2005529119 date "1981-07-01" @default.
- W2005529119 modified "2023-09-29" @default.
- W2005529119 title "A model for the oxidation of Mg(0001) based upon LEED, AES, ELS and work function measurements" @default.
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- W2005529119 doi "https://doi.org/10.1016/0039-6028(81)90560-4" @default.
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