Abstract
The 5 μm transient absorptions over the range 1910–2080 cm −1 and absorption energy were measured in the SF 6-sensitized infrared photodecomposition of Fe(CO) 5 using a transversely excited atmospheric (TEA) CO 2, laser. The rate-determining step is the first decarbonylation step (Fe(CO) 5 → Fe(CO) 4 + CO), and the subsequent decarbonylation processes proceed in the stepwise manner and much faster than the first step. It is suggested that the formation of γ-iron ultrafine particles can be attributed to a high local temperature sufficient for the formation of γ-iron and rapid cooling because of the small particle size and using a short laser pulse.
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