On the Surface Chemical Reactions of Metal and Oxide XPS Samples at 300-400°at a High Vacuum Produced by Oil Diffusion Pumps(Chemistry)
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Metal and oxide surface reactions formed by heating in the spectrometer at 300-400° at a vacuum of ca. 10^<-9> Torr (oil diffusion pumps) were studied. As a result of spectral observations before and after heating, the metals studied were classified into five groups. In the first group, oxide films on the metal surface are easily evaporated because of the high vapour pressure of oxide ; in the second, the oxide films are easily reduced in the spectrometer ; in the thrid, the oxide film formed on the metal is reduced but the bulk oxide is not easily reduced ; in the fourth, very stable oxide films are formed and the bulk oxide is also stable ; and finally in the fifth, the oxide film formed on the metal is apparently reduced, yet the bulk oxide is very stable.
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