Simultaneous assessment of energy, charge state and angular distribution for medium energy ions interacting with ultra-thin self-supporting targets: A time-of-flight approach

Holeňák, Radek; Lohmann, Svenja; Sekula, F.; Primetzhofer, Daniel

doi:10.1016/j.vacuum.2020.109988

Cited by 19 publications

(3 citation statements)

References 40 publications

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“…The HIM provides an ion beam column with electrostatic deflectors that can probe the charge state of He transmitted by candidate foils located in the existing aperture holder. The generation of a He − ion beam has been observed after passing through a graphite membrane with an efficiency comparable to a previous report [11].…”

Section: Introductionsupporting

confidence: 84%

“…Table 1 shows a list of beam counts and transmitted ratios with respect to the estimated total count for the data in figures 3 and 5. The percentage negative He ion beam increased slightly for the test shown in figure 5, however this percentage is still within the expected amount at this energy [11]. The primary difference is the change in percentage of positive and neutral He ion beams, with the majority of the transmitted beam becoming the positive He ion beam.…”

Section: Jinst 19 C01014mentioning

confidence: 75%

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Development of a negative helium ion source with non-metallic charge exchange

Jackle,

Bunevich,

Silva Lopez

et al. 2024

J. Inst.

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Negative helium ion (He−) beams are required for tandem accelerators used at research centers and implanter facilities. The common production method of such beams involves charge exchange between a positive helium ion (He+) source or beam, with a low pressure alkali metal vapour. However, the efficiency of this reaction is poor (only a small percentage) and the alkali metal vapour increases the potential flammability of the interior surfaces of the reaction chamber, as well as contributing to unwanted electrostatic discharge and target contamination downstream. In this paper we describe initial results from experiments using a focused He+ ion microscope (HIM) to measure charge uptake efficiencies after transmission through carbon membranes. The He+ beam (15 keV to 30 keV, 50 fA to 10 pA) collides with a non-metallic foil, and transmitted particles (He+, He0, and He−) are separated electrostatically into discrete beam spots and detected using a radiation camera (AdvaCam MiniPIX). A He− percentage uptake of 0.05 was observed using a 20 nm exfoliated graphite membrane consistent with previous reports. Future work will investigate the efficiency of charge exchange through other suitable membrane materials.

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Section: Introductionsupporting

confidence: 84%

Section: Jinst 19 C01014mentioning

confidence: 75%

Development of a negative helium ion source with non-metallic charge exchange

Jackle,

Bunevich,

Silva Lopez

et al. 2024

J. Inst.

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“…Charge exchange and electronic excitations in the interaction of slow ions with solids are currently the subject of an intense investigation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These processes are important in charge fraction formation, in energy deposition in solids and in several applications such as microscopy and characterization of materials.…”

Section: Introductionmentioning

confidence: 99%

Plasmon Excitation in the Interaction of Slow Singly Charged Argon Ions with Magnesium

Riccardi

2024

Solids

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We report angle-resolved energy spectra of electron emitted in the interaction of slow singly charged heavy ions with Mg surface. The work is focused mainly on the excitation of plasmons of Mg under Argon impact. Potential excitation of plasmons occurs when incoming ions are neutralized at the expense of the potential energy carried by incoming ions. The process competes with the known mechanisms of neutralization via Auger transitions. Differently from Al samples, our results show that the neutralization of Ar+ ions at Mg is dominated by the excitation of surface plasmons by the potential energy released in the electron capture process that neutralizes incoming ions. Bulk plasmon excitation is observed at higher impact energy and is ascribed to fast electrons excited by the transfer of the kinetic energy of incoming particles. The data show that bulk plasmon excitation occur inside the bulk, while the theoretically predicted excitation by potential energy transfer of incoming projectiles is not observed.

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Excitation of the triplet 2p4(3P)3s2 autoionizing state of Neon by molecular orbital electron promotion at solid surfaces

Riccardi

Dukes

2022

Chemical Physics Letters

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Simultaneous assessment of energy, charge state and angular distribution for medium energy ions interacting with ultra-thin self-supporting targets: A time-of-flight approach

Cited by 19 publications

References 40 publications

Development of a negative helium ion source with non-metallic charge exchange

Development of a negative helium ion source with non-metallic charge exchange

Plasmon Excitation in the Interaction of Slow Singly Charged Argon Ions with Magnesium

Excitation of the triplet 2p4(3P)3s2 autoionizing state of Neon by molecular orbital electron promotion at solid surfaces

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