Temat: ion - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: New Approach to Non-Volatile Metal Ion Production Using Plasma Ion Source with Internal Evaporator
Autorzy:: Turek, Marcin
Droździel, Andrzej
Pyszniak, Krzysztof
Filiks, Janusz
Węgierek, Paweł
Tematy:: ion sources
ion implantation
ion beams; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2206283.pdf Link otwiera się w nowym oknie
Opis:: A new approach to application the internal evaporator in an arc discharge ion source is presented, namely a crucible with a plug made of feeding substance. This solution is suitable especially for high-melting point metallic feeding substances. The ion source was tested using Ni and Cr. Basic ion source characteristics, i.e. dependences of ion current and discharge voltage on discharge and filament currents as well as on the external magnetic field flux density are shown and discussed in order to find optimal working conditions. The maximal ion currents were 18 μA for Ni+ and 38μA for Cr+. The stability of the ion current was also tested. It was proven that ion source is able to provide intense ion beam current long enough to perform irradiations with the fluence of ~5×1015 cm-2 confirming the usefulness of the design for ion implantation purposes.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Post acceleration of ions emitted from laser and spark - generated plasmas
Autorzy:: Torrisi, L.
Cavallaro, S.
Rosiński, M.
Nassisi, V.
Paperny, V.
Romanov, I.
Tematy:: post ion acceleration
laser plasma
ion beam
ion implantation; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146658.pdf Link otwiera się w nowym oknie
Opis:: Pulsed lasers at intensities of the order of 1010 W/cm2 interacting with solid matter in vacuum, produce hot plasmas at high temperatures and densities. The charge state distributions of the plasma generate a high electric field, which induces high ion acceleration along the normal to the target surface. The high yield of the emitted ions can generate a near constant current by using repetitive pulses irradiating thick targets. In order to increase ion energy, a post-acceleration system can be employed by using acceleration voltages above 10 kV. Special ion extraction methods can be employed to generate the final ion beam, which is multi-ionic and multi-energetic, due to the presence of different ion species and of different charge states. In this article four different methods of post ion acceleration, employed at the INFN-LNS of Catania, at the IPPLM of Warsaw, at the INFN of Lecce and at the LPI of Moscow, are presented, discussed and compared. All methods are able to implant ions in different substrates at different depth and at different dose-rates.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: The modifications of the JYFL 6.4 GHz ECR ion source
Autorzy:: Koivisto, H.
Liukkonen, E.
Moisio, M.
Nieminen, V.
Suominen, P.
Tematy:: ECR ion source
ion beams; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148664.pdf Link otwiera się w nowym oknie
Opis:: A new JYFL 14 GHz ECRIS was completed in spring 2000 for the nuclear physics program at the Department of Physics, University of Jyväskylä (JYFL). The old JYFL 6.4 GHz ECRIS (built in 1990-1991) is now also available for the material physics experiments and for the research and development work of the ECR ion sources. During the last year remarkable modifications to the structure of the source have been undertaken. In the first phase, which was completed in fall 2001, the axial magnetic field was optimized using the old power supplies and the coils. The radial magnetic field was improved in spring 2002 by installing an iron cylinder around the hexapole permanent magnets. According to the measurements the improvement of about 25% to the radial magnetic field was achieved. The research work to improve the ion beam quality has been started.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: An algorithm for the calculation of heavy ion ranges in SiO2
Autorzy:: Kabadayi, Ö.
Gümüs, H.
Tematy:: ion implantation
ion range
SiO2; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148433.pdf Link otwiera się w nowym oknie
Opis:: The heavy ion ranges in amorphous SiO2 have been calculated by using a technique based on solution of first order ODE’s. Br, Au, Hg, Bi, projectiles have been chosen as incident ion. Since the target is assumed to be amorphous, Bragg’s rule can be used to calculate electronic and nuclear stopping powers in the compound. Numerical solutions have been performed by using Fehlberg fourth-fifth order Runge-Kutta method. The results are compared with experimental data, as well as with the result of the Monte Carlo program SRIM and other standard procedures such as PRAL and WS [19]. It is found that the agreement between our method and the experiment is good and within 10%.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Model studies of the function of blockers on the small conductance potassium ion channel
Autorzy:: Lewiński, Krzysztof
Oleksyn, Barbara
Stec, B.
Ciechanowicz - Rutkowsk, Maria
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Recent ion measurements within the modified DPF-1000U facility
Autorzy:: Kwiatkowski, R.
Czaus, K.
Skladnik-Sadowska, E.
Sadowski, M. J.
Zaloga, D. R.
Paduch, M.
Zielinska, E.
Tematy:: DPF-1000U facility
ion beams
ion energy spectra
ion pinhole images; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148249.pdf Link otwiera się w nowym oknie
Opis:: In this note we describe measurements of ion beams emitted along the z-axis of the DPF-1000U facility operated at 23 kV, 334 kJ, and with the initial deuterium pressure of 1.6–2 hPa. The DPF-1000U device was recently renewed and equipped with a dynamic gas-puff valve placed inside the inner electrode. The investigated ions were recorded by means of ion pinhole cameras equipped with solid state nuclear track detectors of the PM-355® (PADC) type. The energy spectra of ions were determined using a Thomson spectrometer placed on the symmetry axis at a distance of 160 cm from the electrodes outlets. The ion images recorded during discharges performed under different experimental conditions show that the ion beams have a complex structure, usually in the form of a central bunch and an annular stream composed of many micro-beams. Energies of the registered deuterons have been in the range of 30–700 keV, while the fast protons (which originated from the hydrogen remnants) had energies in the range of 300–850 keV.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Exclusive dielectron production in ultraperipheral Pb + Pb collisions at $\sqrt{^{S}NN}$ = 5.02 TeV with ATLAS
Autorzy:: Gil, Damian
Richter-Wąs, Elżbieta
Pałka, Marek
Współwytwórcy:: Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2912
Opis:: Exclusive production of dielectron pairs, γγ $\to e^{+}e^{-}$, is studied using $\mathcal{L}_{int}$ = 1.72 nb$^{-1}$ of data from ultraperipheral collisions of lead nuclei at $\sqrt{^{S}NN}$ = 5.02 TeV recorded by the ATLAS detector at the LHC. The process of interest proceeds via photon–photon interactions in the strong electromagnetic fields of relativistic lead nuclei. Dielectron production is measured in the fiducial region defined by following requirements: electron transverse momentum p$_{T}^{e}$ > 2.5 GeV, absolute electron pseudorapidity $\left|\eta ^{e} \right|$ < 2.5, dielectron invariant mass m$_{ee}$ > 5 GeV, and dielectron transverse momentum p$_{T}^{ee}$ > 2 GeV. Differential cross-sections are measured as a function of m$_{ee}$, average p$_{T}^{e}$, absolute dielectron rapidity $\left| y_{ee} \right|$, and scattering angle in the dielectron rest frame, $\left| cos \theta^{*} \right|$, in the inclusive sample, and also with a requirement of no activity in the forward direction. The total integrated fiducial cross-section is measured to be 215 $\pm$ 1(stat. )$_{-20}^{+23}$(syst. ) $\pm$ 4(lumi. ) μb. Within experimental uncertainties the measured integrated cross-section is in good agreement with the QED predictions from the Monte Carlo programs STARLIGHT and SUPERCHIC, confirming the broad features of the initial photon fluxes. The differential cross-sections show systematic differences from these predictions which are more pronounced at high $\left| y_{ee} \right|$ and $\left| cos \theta^{*} \right|$ values.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Research on spatial and energetic characteristics of the ion beams emitted in the PF - 360 discharges
Autorzy:: Kwiatkowski, R.
Skladnik-Sadowska, E.
Malinowski, K.
Sadowski, M. J.
Czaus, K.
Zebrowski, J.
Garkusha, I. E.
Tematy:: ion beams
PF-360 facility
ion pinhole images; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147918.pdf Link otwiera się w nowym oknie
Opis:: Experimental results are presented on the spatial structure and energetic characteristics of the fast ion beams produced by high-current discharges in a PF-360 device operated at the National Centre for Nuclear Research (NCBJ, Otwock/Świerk, Poland). The 105 kJ discharges were initiated at the initial deuterium pressure around p0 = 6 hPa and were powered from a 234 miF capacitor bank charged up to 30 kV. The spatial structure of the ion beams was recorded using pinhole cameras equipped with the solid-state nuclear track detectors of the PM-355 type, placed at two different angles (0 centigrade, 45 centigrade) relative to the discharge axis. The detectors were shielded by thin absorption filters made of pure Al foils of various thickness, which made it possible to record only ions with energies exceeding a chosen threshold value. Similarly as in other plasma focus (PF) experiments, energies of the emitted ions ranged from about 30 keV to about 3 MeV, i.e. they were much higher than the voltage applied to the electrodes. The recorded ion images showed a complex spatial structure of the fast ion beams, which consisted of many micro-beams of different energies. It is possible that these beams were emitted by various local micro-sources (e.g. plasma micro-diodes) the were formed inside the PF pinch column.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Inhibiting effect of citric acid on the floatability of serpentine activated by Cu(II) and Ni(II) ions
Autorzy:: Huang, Jun-wei
Zhang, Cheng-qiang
Tematy:: copper ion
nickel ion
serpentine
floatation
activation
inhibiting; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110224.pdf Link otwiera się w nowym oknie
Opis:: The laboratory researches about the inhibiting effect of citric acid on the flotation performance of serpentine activated by Cu²⁺ and Ni²⁺ were carried out through micro flotation tests, zeta potential measurements, collector adsorption capacity measurements and solution chemistry analysis. The flotation results showed that Cu²⁺ and Ni²⁺ could remarkably activate the flotation of serpentine when the pH value was more than 6, however, this activation could be effectively weakened by adding citric acid. Zeta potential measurement and adsorption capacity measurement indicated that the presence of citric acid could prevent the adsorption of Cu²⁺ and Ni²⁺, and therefore reduce the adsorption amount of potassium butyl xanthate on serpentine surface. Furthermore, solution chemical analysis of the flotation system showed that copper hydroxide Cu(OH)_2(s) and the nickel hydroxide Ni(OH)2(s) were the main component in the pH range of 9 to 10, which adsorbed onto serpentine surface and made it activated; while the citric acid could effectively prohibit the formation of these metal hydroxide in slurry so as to inhibit the activation impact.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Determination of silver traces in pure metallic copper and zinc by a catalytic photometric method
Autorzy:: Jaskuła, Marian
Sulka, Grzegorz
Opis:: Determination of silver traces in the presence of copper, zinc and sulphate ions by a catalytic method was studied. The highly sensitive method of silver determination is based on the catalytic effect of silver ions on the oxidation of salicylic acid by persulphate in the presence of 2,2'-dipyridyl as an activator. The reaction was followed spectrophotometrically by measuring the rate of change in absorbance with time at 420 nm after 10 min of reagents mixing. The sensitivity, precision and accuracy of the determination of silver traces were investigated in solutions containing excesses of interfering ions. The studied range of interfering ions concentrations was 8 × 10–6 to 2.4 × 10–2 mol dm–3 and corresponds to an amount ratio of interfering to silver ions from 50 to 150 000. The performed analyses showed that the accuracy and precision of silver trace determination by the proposed method is high even in the presence of a huge amount excess of interfering ions. The method was used for quantitative determination of silver contents in a copper foil and in a zinc rod. The obtained results were compared with the analyses performed by FAAS.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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