A source for producing alkali ion beams for low-energy surface scattering spectroscopies

Peale, D. R.; Adler, D. L.; Litt, Barbara; Cooper, B. H.

doi:10.1063/1.1141009

Cited by 23 publications

(8 citation statements)

References 9 publications

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“…[17][18][19] The K + beams were produced in a Colutron ion source which has been modified to allow efficient production of alkali ions from commercially available solid state ion sources. [20][21][22] Beams produced by this source are typically Gaussian in shape with a size of 0.8 mm (FWHM). 23 The incident beams were directed along the ͗100͘ azimuth of a Cu(001) single crystal at an incident angle of 45°from the surface normal.…”

Section: Methodsmentioning

confidence: 99%

Temperature-dependent scattering of hyperthermal energyK+ions

et al. 2004

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Extensive experimental and theoretical results are presented for the scattering of a beam of K + ions incident on a Cu(001) surface along the ͗100͘ azimuth with incident energies of 50 to 154 eV. Energy-resolved scattered intensity spectra reveal three distinct peaks whose widths and intensities vary with surface temperature. Using the results of a classical trajectory simulation, four distinct ionic trajectory types are assigned to these peaks. Using a classical mechanical theory that contains the correct equilibrium thermodynamics of the Cu crystal, general features of the K + energy-resolved spectra are calculated for each trajectory type and compared with the experimental results. For the case of single ion-surface atom collisions, the dependence of the peak intensities and widths on the incident energy and surface temperature is well explained by the classical theory.

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Section: Methodsmentioning

confidence: 99%

Temperature-dependent scattering of hyperthermal energyK+ions

et al. 2004

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“…The alkali ions are produced by a thermionic source built in-house, 27 pass through a Wien velocity filter, and are transported by an ultrahigh vacuum ͑UHV͒ beamline, which was also built in-house. 28 The source produces ions with kinetic energies which are distributed about a mean energy; the width of the distribution is р0.3 eV.…”

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confidence: 99%

Energy and angular distributions of hyperthermal-energyLi+scattered from Cu(001)

1996

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We have measured the in-plane energy and angular distributions of scattered Li ϩ ions that result when Li ϩ ion beams with incident energies E i ϭ100 and 400 eV impinge on Cu͑001͒ with an incident angle i ϭ65°and along the ͗100͘ azimuth. By comparing the energy and angular distributions with those generated by classical trajectory simulations, we extract information about the ion-surface interaction potential. A model ion-surface potential consisting of a sum of Hartree-Fock pair potentials and an attractive term produces good agreement with the measured distributions at both incident energies, while the universal potential of Ziegler, Biersack, and Littmarck does so only for E i ϭ 400 eV. Analysis of the simulated distributions enables us to correlate different types of scattering events with features of the measured distributions ͑e.g., rainbows͒ and so obtain a detailed understanding of the scattering of Li ϩ , which is more complex than has been previously observed for heavier alkali ions ͑e.g., Na ϩ and K ϩ ). We find that the energy loss of the Li ϩ ions can be mostly accounted for by momentum transfer to the surface atoms and that inelastic losses are small but significant for this system at these incident energies. We also find that the thermal vibrations of the surface atoms have dramatic effects on the simulated energy and angular distributions.

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“…All of the ion beams were produced in a Colutron ion source that has been modified to allow highly efficient alkali ion beam production from a solid state source [17]. The beams were scattered along the 100 azimuth of a Cu(001) single crystal sample.…”

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Thermally Enhanced Neutralization in Hyperthermal Energy Ion Scattering

et al. 2003

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Neutralization probabilities are presented for hyperthermal energy Na + ions scattered from a Cu(001) crystal as a function of surface temperature and scattered velocity. A large enhancement in neutralization is observed as the temperature is increased. Velocity-dependent charge transfer regimes are probed by varying the incident energy, with the most prominent surface temperature effects occurring at the lowest energies. The data agree well with results obtained from a model based on the Newns-Anderson Hamiltonian, where the effects of both temperature and velocity are incorporated.

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A source for producing alkali ion beams for low-energy surface scattering spectroscopies

Cited by 23 publications

References 9 publications

Temperature-dependent scattering of hyperthermal energyK+ions

Temperature-dependent scattering of hyperthermal energyK+ions

Energy and angular distributions of hyperthermal-energyLi+scattered from Cu(001)

Thermally Enhanced Neutralization in Hyperthermal Energy Ion Scattering

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