Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. Engl. 6/1991)
The Cover picture shows schematically the possibility of characterizing reactions at high pressure (flange) and high temperatures (red heat) spectroscopically. In the center of the picture are a series NIR spectra which were recorded during the polymerization of ethylene (E) to polyethylene (PE) at 463 K and 2630 bar. In this way the percentage conversion of the polymerization can be monitored directly. More about quantitative absorption spectroscopy in the IR and UV regions at pressures up to 7 kbr and temperatures up to 900 K is reported by M. Buback on p. 641.