| Issue |
J. Phys. Colloques
Volume 40, Number C7, Juillet 1979
XIVe Conférence Internationale sur les Phénomènes d'Ionisation dans les Gaz / XIVth International Conference on Phenomena in Ionized Gases
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| Page(s) | C7-435 - C7-436 | |
| DOI | https://doi.org/10.1051/jphyscol:19797211 | |
XIVe Conférence Internationale sur les Phénomènes d'Ionisation dans les Gaz / XIVth International Conference on Phenomena in Ionized Gases
J. Phys. Colloques 40 (1979) C7-435-C7-436
DOI: 10.1051/jphyscol:19797211
Association EURATOM-FOM, FOM-Institut voor Atoom- en Molecclfysica, Kruislaan 407, Amsterdam-Wgm., The Netherlands
J. Phys. Colloques 40 (1979) C7-435-C7-436
DOI: 10.1051/jphyscol:19797211
H- PRODUCTION BY INTERACTION OF A H+2 - ION BEAM WITH A SURFACE
P. Massmann, H.J. Hopman et J. LosAssociation EURATOM-FOM, FOM-Institut voor Atoom- en Molecclfysica, Kruislaan 407, Amsterdam-Wgm., The Netherlands
Abstract
We present measurements concerning the negative ionization of a H+2-ion beam with energies between 50 and 300 eV impinging on a ThO2-surface. We find negative ionization efficiencies between 2 and 7%. Retardation measurements show that the negative ions are reflected from the surface with an energy of about 0.4 times the incident beam energy. The appearing energy spread suggests that the neutralization of the incident H+2 -ions takes place via resonant electron capture into a repulsive state occurring before collision with the surface.