| Numéro |
J. Phys. Colloques
Volume 49, Numéro C6, Novembre 1988
35th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
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| Page(s) | C6-61 - C6-66 | |
| DOI | https://doi.org/10.1051/jphyscol:1988611 | |
J. Phys. Colloques 49 (1988) C6-61-C6-66
DOI: 10.1051/jphyscol:1988611
HIGH RESOLUTION ION KINETIC ENERGY ANALYSIS OF FIELD EMITTED IONS
J. LIU et T.T. TSONGPhysics Department, The Pensylvania State University, University Park, Pennsylvania, PA 16802, U.S.A.
Abstract
Ion kinetic energy distributions in pulsed-laser stimulated field desorption of inert gases and deuterium, and in field evaporation of metal-helide ions have been obtained by using the high resolution pulsed-laser time-of-flight atom-probe. For field desorption of deuterium in a field of 2.0 V/Å to 3.0 V/Å, field induced resonance tunneling peaks and features of field dissociation process in D+ and D2+ have been clearly observed. The energy distributions of D+ contain a small primary peak which is due to formation of the ions in the ordinary field ionization zone. The secondary peaks, which may be more prominant than the primary peak, are ions formed in field dissociation of those D2+ ions produced in field ionization zone and also in resonance tunneling. As the resolution of the pulsed-laser ToF atom-probe has now been improved by a factor of at least 5, we are also searching for secondary structures produced by the vibrational motion in field dissociation of HeRh2+ ions.