Infrared Matrix-Investigations of the Interaction of Oxygen with Iron Atoms and Aggregates
We report on infrared absorption investigations of the reactivity of Fe n (n=1,2,...) with molecular oxygen in low temperature argon matrices. Besides the known ν o-o IR hne of iron peroxide Fe(O2)1 at 956 cm-1 we observe that the band at ≈873 cm-1 which has been reported for FeO2,3 becomes strong at higher iron concentrations. So far the occurrence of FeO has only been reported when atomic oxygen is formed in the device or at the matrix surface, e. g. by the reaction of O2 with excited rare-gas atoms from a hollow-cathode discharge. In this case also O3 lines have been reported. As we see no O3 lines, it is believed that Fe2 is capable of O-O bond rupture resulting in a reaction product of 2 FeO. — A new band grows at moderate iron concentration at the expense of Fe(O2). It is assigned to the ν o-o mode of a FeO2Fe molecule. A band at 1098 cm-1 is attributed to Fe(O2)2.
KeywordsIron Concentration Iron Atom Bond Rupture Matrix Surface High Iron Concentration
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