Metal Oxide Reactions in Complex Environments: High Electric Fields and Pressures above Ultrahigh Vacuum Page: 53
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changes in the Fe (MVV) Auger transition following oxygen exposure are associated
with the development of different oxide phases [8, 10, 11, 13]. After oxygen exposure of
10 L at 300 K (spectrum B of Fig. 2.3), there is a large reduction in negative-going
intensity of the 47 eV peak and the appearance of a negative-going shoulder at 52 eV. In
addition, the positive-going peak at 36 eV of pure iron shifts to 34 eV. The intensity of
the 52 eV negative-going peak became greater as the oxygen exposure was increased.
2.5
2.5 (a) 300K (b)500 K
2.0
1.0
1.5.5-
1.5- 1.0
0.5
0.5-
0. < 0.0
0.0 400 800 1200 0 1000 2000 3000 4000
02 Exposure (L) 02 Exposure (L)
Fig. 2.2. Evolution of oxygen peak-to-peak heights with 02 exposure for Fe(111) during
oxidation at (a) 300 K; (b) 500 K.
Upon comparison of Auger spectra with reference iron oxide spectra in the literature [8,
13], the negative-going peak at 52 eV can be assigned to Fe304. The shift of the positive-
going peak might be an indication that there is some Fe203 present in the oxide layer at
this stage. It is notable that the Fe304 -containing overlayer (spectrum B of Fig. 2.3)
exhibits the Fe (MVV) transition of metallic iron at 47 eV, possibly due to the
contribution of the underlying metallic iron [8, 13]. After a cumulative oxygen exposure53
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Qin, Feili. Metal Oxide Reactions in Complex Environments: High Electric Fields and Pressures above Ultrahigh Vacuum, dissertation, August 2005; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc4843/m1/64/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .