Low-temperature field evaporation of rhodium in hydrogen atmosphere

The process of field evaporation of rhodium in an atmosphere of 10−6Pa hydrogen at a temperature of 30K was investigated using the high-resolution pulsed-laser time-of-flight atom-probe field-ion microscope. It is found that under these conditions the rhodium evaporates in most part as RhH22+ which...

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Bibliographic Details
Published in:Applied surface science 2002-02, Vol.187 (1-2), p.130-136
Main Author: STEPIEN, Zdzisław M
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron and ion emission by liquids and solids
impact phenomena
Exact sciences and technology
Field dissociation
Field emission, ionization, evaporation, and desorption
Field evaporation
Ion energy distribution
Metal hydride ions
Metals. Metallurgy
Physics
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Summary:The process of field evaporation of rhodium in an atmosphere of 10−6Pa hydrogen at a temperature of 30K was investigated using the high-resolution pulsed-laser time-of-flight atom-probe field-ion microscope. It is found that under these conditions the rhodium evaporates in most part as RhH22+ which is subsequently field dissociated as rhodium and hydrogen. By employing theoretical values of the binding energy and ionization potentials of rhodium hydrides, as calculated by an ab initio method, and using measurements of the energy distribution of the rhodium ions, the binding energy of RhH2 onto the emitter surface is estimated to be 5.09eV.
ISSN:0169-4332
1873-5584
DOI:10.1016/S0169-4332(01)00814-5