Abstract
An auxiliary gas, H 2, of relatively low ionization energy added to Ne leads to field desorption of highly energetic Ne +. Electrons which are released from H 2 during field ionization in space are accelerated towards the emitter surface and impinge upon field-adsorbed neon atoms, thus producing electron-stimulated field desorption (ESFD) of ions. ESFD of Ne + from tungsten is investigated by use of field-ion mass spectrometry combined with retarding potential energy analysis. A model is presented which enables the determination of the following quantities: (i) coverage of field-adsorbed Ne on W, (ii) cross section for ESFD of Ne + from W, (iii) adsorption energy for field-adsorbed Ne on W, and (iv) ion-surface interaction energies and threshold energies for ESFD.
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