Formation of negative hydrogen ions on a coadsorbed layer of cesium and hydrogen on W(110)

Journal Article · Wed Jan 01 04:00:00 EST 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.336871· OSTI ID:6448881

van Amersfoort, P W; Geerlings, J J.C.; Rodink, R; Granneman, E H.A.; Los, J

Negative ion formation on a W(110) surface which is covered with a coadsorbed layer of cesium and hydrogen is studied by scattering a proton beam from such a surface. The primary energy is 400 eV. The angle of incidence is 70/sup 0/ with respect to the surface normal. The hydrogen exposure ranges from 0 to 3000 L. The negative ion formation probability on a surface with 0.6 times the saturation cesium coverage is reduced by a factor of 4 by a hydrogen exposure of 3000 L. At small coverage the reduction is found to be proportional to the number of adsorbed hydrogen atoms. The formation probability on a surface which is covered with a thick cesium layer is hardly affected by a similar exposure. These phenomena are attributed to resonant electron transfer between a negative ion and an adsorbed hydrogen atom.

• Research Organization: Association EURATOM-FOM, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
• OSTI ID: 6448881
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 59:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADSORPTION
ALKALI METALS
ANIONS
BEAMS
CATIONS
CESIUM
CHARGED PARTICLES
COLLISIONS
ELEMENTS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
IONS
METALS
NONMETALS
NUCLEON BEAMS
PARTICLE BEAMS
PROTON BEAMS
SCATTERING
SORPTION
SYNTHESIS
TRANSITION ELEMENTS
TUNGSTEN
TUNNEL EFFECT