The broadening of energy spectra of atoms scattered by a solid surface under molecular ion bombardment

Wojciechowski, I.A.; Medvedeva, M. V.; Ferleger, V. Kh.; Brüning, Karsten; Heiland, W.

doi:10.1016/s0168-583x(98)00385-1

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…Equation ͑3.1͒ does not consider any inelastic effects such as energy loss and straggling. These effects give rise to an asymmetric shape of the spectra, which is discussed in more detail by Wojciechowski et al 7 Närmann et al [23][24][25] These authors use analytic functions to describe the energetic distributions of the forward scattered beam; we found the best agreement with our experimental results when fitting a universal so-called exponentially modified Gauss function ͑EMG͒:…”

Section: Figure 4͑a͒supporting

confidence: 76%

“…4 In our prior work on H 2 ϩ and N 2 ϩ scattered off the ͑110͒and ͑111͒-faces of palladium under grazing incidence, we could show that parallel to a low-index direction, mainly rotational excitation occurs whereas for high-index scattering, vibrational excitation is the main reason for dissociation. [5][6][7] In contrast to molecules such as H 2 or O 2 , charge transfer processes during the interaction of N 2 with metal surfaces are of minor importance for the dissociation process, [8][9][10] even though to a small extent electronical excitation due to violent collisions with surface atoms is possible. 11 N 2 is therefore a perfect system for a direct comparison of N 2 ϩ scattering experiments with purely classical simulations for neutral N 2 .…”

Section: Introductionmentioning

confidence: 99%

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Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Brüning

Heiland

Schlathölter

et al. 2000

The Journal of Chemical Physics

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The dissociation of fast nitrogen molecules with kinetic energies ranging from 200 to 2000 eV/atom was studied for grazing collisions with various fcc surfaces. At these energies, the dissociation is caused by vibrational and rotational excitation, the latter being favored for scattering along the surface semichannels. N 2 is chemically inert and interacts mainly elastically with the surfaces. A controversial question is the role of the dynamic screening of the molecular constituents by the bulk electron gas during the dissociation process. Another interesting issue is the dependence of the dissociation probability on the azimuthal scattering angle-the fragmentation is highest for the low indexed direction. We treat both problems, by comparing results obtained from the different surfaces Pd͑110͒, Ag͑110͒, and Pt͑110͒. The experimental data are compared to molecular dynamics simulations based on realistic interaction potentials as obtained from density functional theory calculations. The potentials are improved by adding an explicit dependence of the intramolecular bond strength on the molecule surface distance z, which leads to excellent agreement of experiment and simulations.

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Section: Figure 4͑a͒supporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Brüning

Heiland

Schlathölter

et al. 2000

The Journal of Chemical Physics

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“…However it is still physically unclear how the screening phenomenon effectively occurs for the excited states of atomic structures where one has noted that a simplified and systematic analytical model is almost entirely absent. Analytical methods for screened atoms are important for studying electronic properties in metalinsulator transitions, charge transport in materials, impurities in semiconductors [30][31][32], charged polymer gels [33][34][35], properties of nanostructures [36,37], molecules adsorbed in metals [38][39][40][41][42][43], hydrogen under pressure, as well as other interesting applications [44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Charge degeneracy removal in the screened hydrogen atom

Penna¹,

Diniz²,

Oliveira³

2009

J. Phys. B: At. Mol. Opt. Phys.

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We derive an analytical model for the states of the screened hydrogen atom by using a new charge degeneracy removal approach. Starting from the nonzero Thomas–Fermi parameter q, we show that screening effect is due to breaks of the charge degeneracy in each quantum level of the hydrogen atom. The charge degeneracy removal reparametrizes the atomic system through the effective nuclear charge αn,l and the appearance of a dual charge γn,l for each quantum level. In this approach, we show that the screening of a quantum state depends hierarchically on the screening from all previous quantum states with the same angular quantum numbers. The excited state energies En,l(q) are analytically found taking into account the contribution of this new charge degeneracy for each quantum level. Finally, we also have estimated accurate critical screening parameters q*n,l for the bound–unbound transition.

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“…The remaining broad part of the spectrum has a pronounced asymmetry. The low-energy tail is well described in terms of energy loss and energy loss straggling for the atoms penetrating deeper into the bulk and traveling longer inside the solid . The focus of our study is the high-energy tail.…”

Section: Introductionmentioning

confidence: 99%

Dissociative Grazing Scattering of H₂⁺ Ions from Metal Surfaces

et al. 2002

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Energy distributions of H atoms resulting from grazing scattering of H 2 + from metal surfaces are calculated analytically and by using classical trajectories simulations. The main mechanism leading to dissociation of H 2 + is proposed to be dissociative capture of an electron from the metal into the antibonding state of the H 2 molecule. It is shown that the energy distributions of scattered atoms yield information of both the molecular axis orientation and the vibrational excitation of the molecules during the scattering process.

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The broadening of energy spectra of atoms scattered by a solid surface under molecular ion bombardment

Cited by 7 publications

References 16 publications

Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Charge degeneracy removal in the screened hydrogen atom

Dissociative Grazing Scattering of H₂⁺ Ions from Metal Surfaces

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The broadening of energy spectra of atoms scattered by a solid surface under molecular ion bombardment

Cited by 7 publications

References 16 publications

Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Dissociation of fast N2 molecules scattered from different fcc(110) surfaces

Charge degeneracy removal in the screened hydrogen atom

Dissociative Grazing Scattering of H2+ Ions from Metal Surfaces

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Product

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Dissociative Grazing Scattering of H₂⁺ Ions from Metal Surfaces