Relative counting efficiencies of ion charge-states by microchannel plate

Yagi, S; Nagata, Tetsuo; Koide, Michi; Itoh, Yoh; Koizumi, T.; Azuma, Y.

doi:10.1016/s0168-583x(01)00724-8

Cited by 27 publications

(16 citation statements)

References 13 publications

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“…In the energy range 0.7-1.5 keV the efficiency curve has a plateau, which then increases gradually from 1.5 to 3.5 keV for Cs atoms. This feature in the energy range above 1.5 kV is in good agreement with the results for Ba C measured by Yagi et al 15 However, in the low energy range the detection efficiency for Cs atoms is much larger than that for Ba C .…”

Section: Measurement Of Detection Efficiency Of the Mcpsupporting

confidence: 92%

Development of the spin‐polarized atom‐surface scattering method for characterizing surface magnetism: detection efficiency of the microchannel plate

Ikedo

Sueyoshi

Shimizu

et al. 2005

Surface & Interface Analysis

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The energy, charge and angle dependence of the detection efficiency of the microchannel plate (MCP) for caesium (Cs) atoms and ions was studied for measuring the spin asymmetry of the ionization probability in the atom-surface scattering process. Based on the model of a spin-dependent scattering of a spin-polarized and energy-tunable Cs atomic beam at a magnetic surface, we have developed a new experimental method for characterizing surface magnetism.

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Section: Measurement Of Detection Efficiency Of the Mcpsupporting

confidence: 92%

Development of the spin‐polarized atom‐surface scattering method for characterizing surface magnetism: detection efficiency of the microchannel plate

Ikedo

Sueyoshi

Shimizu

et al. 2005

Surface & Interface Analysis

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show abstract

“…, where n β is the number of observed βs from trapped 137 I, accounting for backgrounds from 137 Te and 137 Xe β decay, untrapped 137 I β decay, and radiation from the room. The intrinsic detection efficiency of an MCP approaches the open-area ratio (OAR) for ions with > ∼ 2 keV of kinetic energy [49][50][51][52], regardless of species or charge state [53,54]. Here, the recoil ions are all charge state 2 + or higher, and strike the MCP well above detection threshold with kinetic energies > 5.3 keV, ensured by the -2.65 kV potential applied to the MCP face.…”

Section: For Decays Of Trappedmentioning

confidence: 99%

β-Delayed Neutron Spectroscopy Using Trapped Radioactive Ions

et al. 2013

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“…The photoion-yield spectra obtained were normalized to the incident photon flux monitored with the drain current at a post-focusing mirror. In the present study, the detection efficiency of doubly charged ions is larger by 5%~15% than that of singly charged ions, depending on the mass of the atom [4]. However, the present photoion-yield spectra have not been corrected for this difference because it is not essential for the discussion that follows.…”

Section: Methodsmentioning

confidence: 72%

Observation of high-lying weak autoionizing resonances of Ne, and Mg atoms by charge-separated photoion-yield method

Katō

Osawa

Obara

et al. 2007

J. Phys.: Conf. Ser.

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Photoabsorption and subsequent decay of Na and Mg atoms T Osawa, Y Tohyama, S Obara et al. 3pnp autoionizing resonance series of Ne atom as well as autoionizing resonances in the 2s region of Na and Mg atoms have been studied with monochromatized synchrotron radiation. Use of charge-separated photoion-yield method allowed us to detect these weak resonances in a clarified way in the yield curves of doubly-charged ions. The observed resonance states have been interpreted with the help of MCDF calculations, and the decay processes of these resonance states are discussed briefly. IntroductionAutoionizing resonances in photoabsorption of atoms have been a subject of extensive experimental and theoretical studies. Resonances in rare-gas atoms, which show typical Beutler-Fano profiles [1], have been precisely studied and have often been used for calibrating the photon energies. It is quite natural that the spectrum of inner-shell resonance-excitations or outer-shell resonant double excitation is superimposed on a strong valence ionization continuum. As the inner shell concerned becomes deeper, the resonance states in the spectrum are superimposed on two or more continua and result in not only singly charged ions but also multiply charged ions with respective probabilities. Excitation of such high-lying resonance states is generally quite weak, and we may face a difficulty in discriminating the excitations from the spectra of photoabsorption, total photoions, or photoelectrons, especially for metallic vapors which need high oven temperatures. In this respect, the chargeseparated photoion-yield method as used in this study is often advantageous because weaker resonances are observed in a clarified way in the double and even multiple ionization channels whose background levels are relatively low. In addition, from this kind of measurement, we may obtain information about the decay processes of observed resonance states, as well as the resonance energies and the associated configuration interaction comparing experiment with theoretical calculations.We have carried out an experiment of charge-separated photoion spectroscopy for Ne, Na, and Mg atoms in the region of 2s ionization and have observed weak high-lying autoionizing resonances. In this report, we present the experimental spectra, describe the results of assignment and profile analysis of the resonance features, and, for the Ne and Na cases, mention briefly the decay processes of the resonance states. The details of the assignment based on furthermore precise calculations will be given and discussed in a forthcoming paper. As far as we know, the resonance series observed in this study for Ne and Mg atoms have not been reported previously.

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Relative counting efficiencies of ion charge-states by microchannel plate

Cited by 27 publications

References 13 publications

Development of the spin‐polarized atom‐surface scattering method for characterizing surface magnetism: detection efficiency of the microchannel plate

Development of the spin‐polarized atom‐surface scattering method for characterizing surface magnetism: detection efficiency of the microchannel plate

β-Delayed Neutron Spectroscopy Using Trapped Radioactive Ions

Observation of high-lying weak autoionizing resonances of Ne, and Mg atoms by charge-separated photoion-yield method

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