Formation of H− on thin aluminum films

Borisov, A.G.; Winter, H.

doi:10.1016/0168-583x(96)01518-2

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…175 Aluminum was chosen as the material to study the formation of H À ions by scattering from a thin film to investigate the quantization effect along the direction of the surface normal. 176 More recently, survival of H À ions near the cluster surface of Al was studied to investigate the quantum-size effect. 177 The formulation was also given for grazing angle scattering onto a spherical Al cluster.…”

Section: B Theoretical Work On H 2 Surface Productionmentioning

confidence: 99%

Negative hydrogen ion production mechanisms

Bacal

Wada

2015

Applied Physics Reviews

246

173

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International audienceNegative hydrogen/deuterium ions can be formed by processes occurring in the plasma volume and on surfaces facing the plasma. The principal mechanisms leading to the formation of these negative ions are dissociative electron attachment to ro-vibrationally excited hydrogen/deuterium molecules when the reaction takes place in the plasma volume, and the direct electron transfer from the low work function metal surface to the hydrogen/deuterium atoms when formation occurs on the surface. The existing theoretical models and reported experimental results on these two mechanisms are summarized. Performance of the negative hydrogen/deuterium ion sources that emerged from studies of these mechanisms is reviewed. Contemporary negative ion sources do not have negative ion production electrodes of original surface type sources but are operated with caesium with their structures nearly identical to volume production type sources. Reasons for enhanced negative ion current due to caesium addition to these sources are discussed. (31 pages, 265 refs

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Section: B Theoretical Work On H 2 Surface Productionmentioning

confidence: 99%

Negative hydrogen ion production mechanisms

Bacal

Wada

2015

Applied Physics Reviews

246

173

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“…With increase of the film thicknesş the widths (D) converge towards the results for the semi-infinite metal. We observe no step structures in the dependence of the width on the distance D. Those structures, observed for the width of H\-ion in front of the Al-films [26], are due to the crossings of discrete energies E L by E ? (D) (it corresponds to the opening/closing of the k "" continuum associated with E L ).…”

Section: Resultsmentioning

confidence: 80%

Neutralization of Na+-ions in grazing scattering from the surface of thin Al-films

Borisov

Winter

1996

Z Phys D - Atoms, Molecules and Clusters

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A theoretical study on the formation of the Na I 3s-term in grazing scattering of Na>-ions from the (1 1 1)-surface of an aluminum crystal and a thin film is performed. For the crystal-surface we find quantitative agreement between experimental and theoretical results. For a thin film the quantization of the electronic states in the direction normal to the surface strongly influences the charge-exchange process. The dependence of the neutral fractions in the scattered beam on the projectile velocity is predicted to be clearly different for electron capture from the film and the semi-infinite crystal.

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“…Electron transfer is qualitatively different for systems with finite size. 3,4 The blocking of electron propagation along the surface normal, which is the preferential direction for tunneling, should have the biggest effect on the RCT. One can mention the recent studies of the effect of the projected band gap along the surface normal for the ͑111͒ surfaces of noble metals.…”

Section: Introductionmentioning

confidence: 99%

Quantum size effect in the electron exchange between aH−ion and a thin metal disk

Gainullin

Уразгильдин

2006

Phys. Rev. B

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The resonant charge transfer ͑RCT͒ between a hydrogen anion and a thin aluminum disk is investigated by means of the wave-packet propagation method that does not exploit the perturbation theory. The RCT on a thin metal disk is found to exhibit quantum size effects due to the finite size of the disk. Survival amplitude of ion state has been calculated as a function of the distance to the ion-surface in a normal collision. It is shown that depending on the projectile velocity, the ion can interact with disk as if with bulk metal, thin film or nanostructure with the energy quantized by polar and normal coordinates.

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Formation of H− on thin aluminum films

Cited by 15 publications

References 20 publications

Negative hydrogen ion production mechanisms

Negative hydrogen ion production mechanisms

Neutralization of Na+-ions in grazing scattering from the surface of thin Al-films

Quantum size effect in the electron exchange between aH−ion and a thin metal disk

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