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We combine in situ X-ray photoelectron spectroscopy and ex situ electron and Raman spectroscopy to study chemical interactions of SiO 2 -supported Fe catalyst films during C 2 H 2 exposure in the 400–600°C temperature range. Carbon nanotubes nucleate at C 2 H 2 pressures below 10 −6 mbar, which allows a time-resolved recording of core level spectra....
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