Molecular Beam Relaxation Spectroscopy Applied to Adsorption Kinetics on Small Supported Catalyst Particles
A new apparatus performing adsorption-desorption kinetics experiments on small supported particles, by the MBRS technique, is presented. The clusters are prepared by in-situ condensation of a collimated Pd beam on MgO(100). A nozzle molecular beam source gives a directed beam of CO (or He) which is chopped at frequencies from= 0 up to 400 Hz. The molecules re-emitted from the sample are synchronously detected by a mass-spectrometer. The signal is analysed in time or in frequency with in line FFT. Angular distribution of the scattered beam is obtained by a 2nd, rotatable, mass-spectrometer. An example of Pd deposit and typical angular and temporal measurements are presented.
KeywordsAngular Distribution Time Domain Analysis Main Chamber Scattered Beam Knudsen Cell
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