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Field adsorption and desorption of hydrogen on W(110) — an atom-probe study

1986; Elsevier BV; Volume: 176; Issue: 1-2 Linguagem: Inglês

10.1016/0039-6028(86)90174-3

1879-2758

M. Hellsing, B. Hellsing,

Diamond and Carbon-based Materials Research

An atom-probe study is presented of the electric field dependence of adsorption and desorption of hydrogen on tungsten (110). A distinct threshold field strength of approximately 3.8 V/Å was found for the desorption of hydrogen at 90 K. A simple theoretical model based on the Newns-Anderson model is presented to give a qualitative understanding of the experimental observations. Within this model a direct proportionality is derived between the reduction in binding energy of the adsorbate and the field strength.