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Dynamics of Surface Reactions Studied by Field Emission Microscopy and Atom-probe Mass Spectrometry by N. Kruse is a Physics and Astronomy article available to read on EtoBox.

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Recent progress in imaging surface chemical reactions and adsorbate-induced reconstruction by means of field ion microscopy is reviewed. Achievements and prospects of a local chemical analysis during imaging are also presented and discussed. Major shape transformation is reported to occur during the field-free interaction of oxygen with Rh crystal tips. Rather than hemispherical when clean they appear polyhedral after reaction at temperatures between 500 and 550 K. Kinetic non-linearities are found in both the NO and NO 2 reaction with hydrogen on the surface of a pyramidal Pt crystal tip. Oscillatory reaction behavior is observed for both reactions. In the NO 2 -H 2 case explosive ignition in {0 1 2} planes is followed by one-dimensional chemical wave propagation along the /1 0 0S zone lines. Atom-probe time-offlight mass spectrometry demonstrates that water (field ionized as H 2 O + and H 3 O + ) is the product of the catalytic reaction. During the NO/H 2 reaction, dynamic formation and motion of small islands are observed. These islands appear on the (0 0 1) pole and are interpreted as being due to adsorbed hydroxyl species. Island sizes are confined to the equivalent of 10-30 P

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Author

N. Kruse

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3991)

Published

2001

Language

EN

Field

Physics and Astronomy (Physical Sciences)