Chromocene anchored on silica has been investigated by Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS). The mid infrared spectrum of this olefin polymerization catalyst has been obtained before and after treatment with ethylene. A model complex for a key intermediate in the olefin polymerization has been observed. The design of a vacuum jacketed PA cell for use in a vacuum bench FT-IR spectrometer is also presented.

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