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The use of a gas-reaction stage in an electron microscope extends the range of applications for the instrument and provides a new tool for the study of reaction mechanism in many chemical systems. A JEM 7A high resolution electron microscope has been adapted to incorporate a modified JEOL AGI gas reaction attachment. The technique developed allows for continuous observation of reactions between gases and solids at temperatures up to 1500 K and pressures of up to 30 kN m-2. Continuous recording of the transmission image by a simple video system provides immediate recall and a record which is readily available for subsequent detailed analysis. The limitations and advantages of the technique are critically assessed.
Baker et al. (Tue,) studied this question.