Absolute and angular efficiencies of a microchannel-plate position-sensitive detector

Gao, R. S.; Gibner, P. S.; Newman, J. H.; Smith, K. A.; Stebbings, R. F.

doi:10.1063/1.1137671

Cited by 172 publications

(58 citation statements)

References 9 publications

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“…Some ions pass through a grid-covered aperture, of length 1.91 cm in the direction parallel to the electron beam, in the bottom plate. These ions are then accelerated to an energy of 5.4 keV and subsequently impact a position-sensitive detector ͑PSD͒, comprising a pair of 25 mm diameter microchannel plates and a resistive-encoded anode, 13 which records their arrival times and positions. The ion arrival times are used to identify their mass-to-charge ratios and the ion arrival positions are used to determine the effectiveness of product ion collection.…”

Section: Apparatus and Experimental Methodsmentioning

confidence: 99%

Absolute partial cross sections for electron-impact ionization of CH4 from threshold to 1000 eV

Straub

Lin

Lindsay

et al. 1997

The Journal of Chemical Physics

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112

103

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Absolute electron-impact total ionization cross sections of chlorofluoromethanes Absolute partial cross sections for electron-impact ionization of NO and NO 2 from threshold to 1000 eV Absolute partial cross sections for electron-impact ionization of H 2 O and D 2 O from threshold to 1000 eV Absolute partial cross sections for the production of CH 4 ϩ , CH 3 ϩ , CH 2 ϩ , CH ϩ , C ϩ , H 2 ϩ , and H ϩ from electron-impact ionization of CH 4 are reported for electron energies from threshold to 1000 eV. The product ions are mass analyzed using a time-of-flight mass spectrometer and detected with a position-sensitive detector whose output demonstrates that all product ions are completely collected. The overall uncertainty in the absolute cross section values is Ϯ3.5% for singly charged parent ions and is slightly greater for fragment ions. Although previous measurements are generally found to agree well with the present results for CH 4 ϩ and CH 3 ϩ , almost all previous work for the remaining fragment ions lies lower than the present results and in the case of H ϩ is lower by approximately a factor of 4.

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Section: Apparatus and Experimental Methodsmentioning

confidence: 99%

Absolute partial cross sections for electron-impact ionization of CH4 from threshold to 1000 eV

Straub

Lin

Lindsay

et al. 1997

The Journal of Chemical Physics

Self Cite

112

103

View full text Add to dashboard Cite

show abstract

“…The former creation process is a statistical process that depends, among others, on the kinetic energy of the ions. 28,29 The latter charge multiplication process depends on the configuration of the channelplates and the voltage applied across the plates. 14,30 In addition, it is important to note that ageing of the channelplates can cause deterioration of the charge multiplication process.…”

Section: Channelplate Efficiencymentioning

confidence: 99%

Influence of analyser transmission and detection efficiency on the energy dependence of low-energy ion scattering signals

Cortenraad

Gon

Brongersma

2000

Surf. Interface Anal.

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The signal intensity in low-energy ion scattering depends, among others, on the kinetic energy of the scattered ions. The measured energy dependence is a combination of the intrinsic energy dependence, determined by the ion-sample interaction, and the energy dependence of the instrumental response function. The intrinsic energy dependence is often exploited to obtain information on the charge transfer processes taking place between the ions and the sample surface. The resulting information is of relevance both for quantitative surface analysis as well as for obtaining a fundamental understanding of charge transfer processes. For a correct determination of the intrinsic energy dependence it is crucial that the energy dependencies of the analyser transmission and the ion detection efficiency of the instrument are accurately known.In this paper we outline how these energy dependencies may be obtained, and we present the results for the cylindrical mirror analyser and microchannelplate-based detector in our apparatus. The discussions about the energy dependencies are not specific for our apparatus, but can be applied directly to other cylindrical mirror analysers and channelplate-based detectors. Therefore, the similarities and differences with other types of analysers are briefly discussed. The implications of uncertainties in these energy dependencies for charge-exchange studies and quantitative compositional surface analysis are treated in detail.

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“…It attenuated the primary beam to less than 0.1% of the saturation limit of MCP. The particle energy dependence of the MCP quantum efficiency has been studied in many works [48][49][50][51][52]. They concluded that the quantum efficiency of MCP saturates and converges to a constant value when the particle energy exceeds a certain threshold.…”

Section: Methodsmentioning

confidence: 98%

“…They were covered with nearly transparent grids, which had negative voltage relative to the MCP front surfaces to maximize the detection efficiency [47,48]. The MCP for the projectile detection had a delay line anode to generate a position signal.…”

Section: Methodsmentioning

confidence: 99%

Charge transfer of slow highly charged xenon ions in collisions with magnesium atoms

et al. 2013

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We report an experimental study of the charge-transfer process in collisions of Xe q+ ions (16 q 20) with magnesium atoms at an energy of 5.5q keV. With charge-selective and time-coincidence techniques, we separated the pure capture and capture accompanied by transfer-ionization processes. The experimental data indicate that the magnesium target is around two times more likely to lose two electrons than one in the collision. This finding is very different compared to the calculation based on the extended classic over-the-barrier model. The Xe q+ -Mg collision also behaves very differently from "traditional" collisions between highly charged ions and noble gases. We suggest a one-step dielectronic mechanism for the capture process. The data also show that autoionization dominates the relaxation process after the capture, and fluctuation of the autoionization fraction versus the projectile charge state indicates that for the relaxation processes, the projectile core structure plays a more important role than the detailed characteristics of the projectile states where the target electrons are initially captured.

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Absolute and angular efficiencies of a microchannel-plate position-sensitive detector

Cited by 172 publications

References 9 publications

Absolute partial cross sections for electron-impact ionization of CH4 from threshold to 1000 eV

Absolute partial cross sections for electron-impact ionization of CH4 from threshold to 1000 eV

Influence of analyser transmission and detection efficiency on the energy dependence of low-energy ion scattering signals

Charge transfer of slow highly charged xenon ions in collisions with magnesium atoms

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