Use of a quadrupole mass filter for high energy resolution ion beam production

Smolanoff, Jason; Adam, L.; apicki,; Anderson, Scott L.

doi:10.1063/1.1146494

Cited by 18 publications

(14 citation statements)

References 12 publications

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“…The guided ion beam tandem mass spectrometer used in these experiments has been described in detail previously 28,29 and only a brief summary is given here. Boron cluster ions are produced by laser ablation of isotopically pure 11 B ͑Eagle Pitcher, 98.6 at.%͒ inside a radio frequency ͑rf͒ trap.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This is insufficient to cleanly mass select the beam for the larger cluster sizes, and the experiments were repeated after replacing the Wien filter with a quadrupole mass filter equipped with injection/extraction optics optimized for production of beams with narrow kinetic energy distributions. 29 The absolute error in the cross section measurements is due primarily to possible differences in the collection efficiency for product and reactant ions. ͑The effective scattering cell length is calibrated using the well-studied reaction Ar ϩ ϩD 2 ϪDϩArD ϩ ͒.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Interaction of small boron cluster ions with HF

Sowa-Resat

Smolanoff

Łapicki

et al. 1997

The Journal of Chemical Physics

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Articles you may be interested inHighly stable and symmetric boron caged B @ Co 12 @ B 80 core-shell cluster Appl. Phys. Lett. 94, 133102 (2009); 10.1063/1.3111444 Formation of hydrogenated boron clusters in an external quadrupole static attraction ion trap A combined experimental and theoretical study of the reactivity of small boron cluster cations with HF is reported on in this article. Cross sections for the reaction of mass-selected boron ͑B n ϩ , n ϭ2 -14͒ and boron monohydride ͑B n H ϩ , nϭ4, 7, and 10͒ cluster ions with HF are reported for collision energies from 0.1 to 10 eV. The reaction proceeds via a chemically bound intermediate complex, and the major product channels involve elimination of BF or H from the B n HF ϩ intermediate. Both reactivity and product branching depend strongly on cluster size. Reactivity at low energies generally decreases with increasing size, with the appearance of significant bottlenecks to reaction. The effect of adding a hydrogen atom to the reactant clusters was examined for several cluster sizes. In contrast to the boron oxides, hydrogenation of elemental boron cluster ions has little effect on reactivity with HF, suggesting that H does not compete effectively for HF binding sites. The results provide a sensitive test for the accuracy of ab initio calculations on B n ϩ and B n H ϩ and B n F ϩ , and the calculations provide insight into the reaction mechanism and effects of cluster structure on reactivity.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Interaction of small boron cluster ions with HF

Sowa-Resat

Smolanoff

Łapicki

et al. 1997

The Journal of Chemical Physics

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“…S1, ESI †) arise from single scattering events, mostly involving atoms in the top-most layer of the sample. 38,71,72,[85][86][87] Because the samples all contain the same total number of Pt atoms, intensity variations with cluster size provide insight into morphology. If the clusters deposit as single layer thick islands, then all the Pt is in the top layer, resulting in maximum Pt ISS intensity.…”

Section: Cluster Morphology From As-deposited Issmentioning

confidence: 99%

Oxygen activation and CO oxidation over size-selected Pt_n/alumina/Re(0001) model catalysts: correlations with valence electronic structure, physical structure, and binding sites

Roberts

Kane

Baxter

et al. 2014

Phys. Chem. Chem. Phys.

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Oxidation of CO over size-selected Ptn clusters (n = 1, 2, 4, 7, 10, 14, 18) supported on alumina thin films grown on Re(0001) was studied using temperature-programmed reaction/desorption (TPR/TPD), X-ray and ultraviolet photoelectron spectroscopy (XPS/UPS), and low energy ion scattering spectroscopy (ISS). The activity of the model catalysts was found to vary by a factor of five with deposited Ptn size during the first reaction cycle (TPR) and by a factor of two during subsequent cycles, with Pt2 being the least active and Pt14 the most active. The limiting step in the reaction appears to be the binding of oxygen; however, this does not appear to be an activated process as reaction is equally efficient for 300 K and 180 K oxidation temperatures. Size-dependent shifts in the valence band onset energy correlate strongly with CO oxidation activity, and there is also an apparent correlation with the availability of a particular binding site, as probed by CO TPD. The morphology of the clusters also becomes more three dimensional over the same size range, but with a distinctly different size-dependence. The results suggest that both electronic structure and the availability of particular binding sites control activity.

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“…The aperture was designed to minimize interaction of the collected ions with the strong fringe fields in the quadrupole-lens gap. 19 In addition, the collection lens set includes a split lens pair that was used to time-gate the ion pulse. The combination of controlled collection radius and time-gating allows us to produce a mass-selected beam with narrow kinetic energy spread (⌬EϷ0.1 eV).…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

The effects of vibrational mode and collision energy on the reaction of formaldehyde cation with carbonyl sulfide

Devener

Anderson

2002

The Journal of Chemical Physics

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Vibrational mode and collision energy effects on reaction of H 2 CO + with C 2 H 2 : Charge state competition and the role of Franck-Condon factors in endoergic charge transferThe effects of collision energy (E col ) and five different H 2 CO ϩ vibrational modes on the title reaction have been studied, including measurements of product ion recoil velocity distributions. A series of ab initio and Rice-Ramsperger-Kassel-Marcus calculations were used to examine properties of various complexes and transition states that might be important. Four product channels are observed. Proton transfer ͑PT͒ dominates at low E col , and is suppressed by E col but mildly enhanced by H 2 CO ϩ vibrational excitation. PT occurs by a direct mechanism at high energies, but appears to be mediated by reactantlike complexes at low energies. The other major low energy channel corresponds to H 2 ϩ transfer, and the majority of these product ions go on to eliminate CO, producing H 2 S ϩ . Both H 2 ϩ transfer and H 2 S ϩ channels are strongly inhibited by E col and vibrational excitation, which is interpreted in terms of competition with other channels. Charge transfer occurs in short time scale collisions at all energies, and is strongly enhanced by E col and by vibrational excitation. The vibrational effects for all channels are mode specific.

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Use of a quadrupole mass filter for high energy resolution ion beam production

Cited by 18 publications

References 12 publications

Interaction of small boron cluster ions with HF

Interaction of small boron cluster ions with HF

Oxygen activation and CO oxidation over size-selected Pt_n/alumina/Re(0001) model catalysts: correlations with valence electronic structure, physical structure, and binding sites

The effects of vibrational mode and collision energy on the reaction of formaldehyde cation with carbonyl sulfide

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Use of a quadrupole mass filter for high energy resolution ion beam production

Cited by 18 publications

References 12 publications

Interaction of small boron cluster ions with HF

Interaction of small boron cluster ions with HF

Oxygen activation and CO oxidation over size-selected Ptn/alumina/Re(0001) model catalysts: correlations with valence electronic structure, physical structure, and binding sites

The effects of vibrational mode and collision energy on the reaction of formaldehyde cation with carbonyl sulfide

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Product

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Oxygen activation and CO oxidation over size-selected Pt_n/alumina/Re(0001) model catalysts: correlations with valence electronic structure, physical structure, and binding sites