Abstract
An ultrahigh vacuum apparatus has been developed to study the dynamics of gas–surface interactions utilizing modulated supersonic molecular-beam techniques, angle-resolved mass spectrometry, Auger electron spectroscopy, and low-energy electron diffraction. Nearly monoenergetic beams of atoms and molecules in the form of narrow pulses or square waves are sent with a variable incident angle at a crystal. The wave forms of the scattered species or reaction products are monitored as a function of desorption or reflection angle. The initial experiments have examined the scattering of atoms and simple molecules from a Pt(111) surface. The results are in the form of angular and time-of-flight distributions for a range of incident beam energies, angles, and crystal temperatures.
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