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Title: Oxidation and growth of Mg thin films on Ru(001)
Authors: Huang, H.H. 
Jiang, X.
Siew, H.L.
Chin, W.S. 
Sim, W.S. 
Xu, G.Q. 
Issue Date: 10-Aug-1999
Citation: Huang, H.H., Jiang, X., Siew, H.L., Chin, W.S., Sim, W.S., Xu, G.Q. (1999-08-10). Oxidation and growth of Mg thin films on Ru(001). Surface Science 436 (1) : 167-174. ScholarBank@NUS Repository.
Abstract: The oxidation and growth of ultra-thin Mg films on a Ru(001) substrate have been studied using X-ray photoelectron spectroscopy (XPS) and thermal desorption spectroscopy (TDS) in the temperature range of 300-1500 K. Our results suggest that the growth of Mg thin films follows a layer-by-layer mode. Upon oxygen adsorption at 300 K, two O 1s peaks were detected on the Mg film. The peak at 532.2-532.6 eV could be attributed to either dioxygen or partially reduced species (Oδ-, δ < 2), whereas that at 530.1-530.6 eV is due to lattice oxygen in MgO. Annealing of the oxidized film to 800 K causes the conversion of the dioxygen or partially reduced species to the oxide state. Thermal desorption peaks of MgO were directly detected at 1000-1127 and 1350-1380 K, respectively. However, initial evaporation of Mg atoms onto an oxygen pre-adsorbed surface yields a fully oxidized MgO. Further Mg deposition results in the formation of a partially oxidized film with the observation of an O 1s peak at 532.2 eV.
Source Title: Surface Science
ISSN: 00396028
DOI: 10.1016/S0039-6028(99)00660-3
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