Non-Adiabatic Processes in Field Desorption Phenomena
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The field-induced desorption phenomenon  of surface atoms or adsorbed molecules gives direct information about the microscopic states of surface atoms. Recently qualitatively different behaviors were found between strongly adsorbed (chemisorbed) and weakly adsorbed (physisorbed) hydrogen-metal surface systems when the high electric field was applied. In the strongly adsorbed systems of hydrogen on Fe or Ni, H+ ions were detected . On the other hand, in the weakly adsorbed systems of hydrogen on A1 or Cu, dominant desorbed species are metal hydride ions and the proportion of the desorbed H+ is small. Such behavior is puzzling from the usual view points of the chemical reaction, since the weaker bond might be considered harder to dissociate.
KeywordsHigh Electric Field Desorption Rate Airy Function Adiabatic Limit Field Evaporation
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