Abstract
The authors report the observation of dissociation resulting from irradiation of Fe(CO)/sub 5/ deposited onto single crystal Al/sub 2/O/sub 3/, Si(100), and Ag(110) surfaces in ultrahigh vacuum. Photolytic effects are observed without competition from laser-induced heating of the substrate. Decomposition is measured by mass spectrometric detection of the CO released from the surface. The postulated mechanism involves the direct absorption of 337-nm radiation by the physisorbed Fe(CO)/sub 5/ and subsequent fast dissociation. The Fe-containing photoproducts remain on the surface, although they are not identified. The dissociation yield is very similar for Fe(CO)/sub 5/ and Al/sub 2/O/sub 3/ and Ag(110) surfaces, which indicates that the rate of photofragmentation is competitive with energy transfer to the surface for each of the three substrates. Also, an annealing process, which results in a short initial burst of Fe(CO)/sub 5/ from the surface, is observed.
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