Results 251 to 260 of about 6,174,975 (303)
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Canadian Journal of Research, 1948
Positive ions are formed in a low pressure electrodeless discharge which is excited by the radio-frequency field of a coil coupled to a 15 Mc. per sec. oscillator. The ions are extracted from the discharge through a pumping canal (2 mm. in diameter × 12 mm. in length) by a simple arrangement of electrodes. After further focusing and acceleration to 50
A J, BAYLY, A G, WARD
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Positive ions are formed in a low pressure electrodeless discharge which is excited by the radio-frequency field of a coil coupled to a 15 Mc. per sec. oscillator. The ions are extracted from the discharge through a pumping canal (2 mm. in diameter × 12 mm. in length) by a simple arrangement of electrodes. After further focusing and acceleration to 50
A J, BAYLY, A G, WARD
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Nature, 1950
RECENTLY, several authors have postulated the existence of positive monovalent bromine ions on purely theoretical grounds1,2, or in order to explain the fact that hypobromous acid (HOBr) acts as a powerful brominating agent in strongly acid solutions3.
K, GONDA-HUNWALD, G, GRAF, F, KOROSY
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RECENTLY, several authors have postulated the existence of positive monovalent bromine ions on purely theoretical grounds1,2, or in order to explain the fact that hypobromous acid (HOBr) acts as a powerful brominating agent in strongly acid solutions3.
K, GONDA-HUNWALD, G, GRAF, F, KOROSY
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The positive ion injector for ALPI
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996Abstract In the framework of the ALPI upgrading, a new positive ion injector is foreseen in order to be able to accelerate ions with masses of the order of 200 and with high charge states from the velocity of β = 0.009 up to β = 0.055. The structures chosen for that velocity range are superconducting radio frequency quadrupoles operating at a ...
BISOFFI G. +4 more
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Chemistry of Positive Ions. VI. Positive-Ion Chemistry in Solid Methane
The Journal of Chemical Physics, 1966The polymerization of solid methane at 77°K by γ rays was studied at two dose rates in the dose range 4 to 150 Mrad, corresponding to 0.04% to 1.4% conversion. The polymer contains an average of 20 carbon atoms per molecule and its empirical formula is C20H40, independent of the dose.
Donald R. Davis +2 more
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Photoionization of positive ions
Physics Letters A, 1973Abstract Calculations of the photoionization cross sections of the positive ions C3+, O3+, Ne3+ and Mg3+ are reported.
T.L. John, D.J. Morgan
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The Stochastics of the Positive Ion Penumbra
Radiation Research, 1994Statistical analysis of Monte Carlo simulations of positive ion track structure is presented for 1 MeV protons passing outside an absorbing region of interest. Energy deposition and production of ionization within the region occur only by delta-ray transport from the ion's path.
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Physical Review, 1969
Binary encounter model for ionization by charged particle impact modified to evaluate cross section for ionization of positive ions by electron ...
Brian K. Thomas, J. D. Garcia
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Binary encounter model for ionization by charged particle impact modified to evaluate cross section for ionization of positive ions by electron ...
Brian K. Thomas, J. D. Garcia
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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1957
Abstract We describe a method of measuring the ionization cross-section of atoms by positive ions, in which electrons are collected from single collisions of an ion beam passing through a gas at low pressures. Secondary electrons formed by the collisions of ions with surfaces are suppressed.
H. B. Gilbody, J. B. Hasted
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Abstract We describe a method of measuring the ionization cross-section of atoms by positive ions, in which electrons are collected from single collisions of an ion beam passing through a gas at low pressures. Secondary electrons formed by the collisions of ions with surfaces are suppressed.
H. B. Gilbody, J. B. Hasted
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Canadian Journal of Chemistry, 1969
Progress over the past five years in the measurement of rate coefficients and cross sections for interactions between positive ions and neutral molecules of particular interest to aeronomy is reviewed. Emphasis is placed on the methods of experimentation developed for studies in the range of thermal energies and slightly above.
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Progress over the past five years in the measurement of rate coefficients and cross sections for interactions between positive ions and neutral molecules of particular interest to aeronomy is reviewed. Emphasis is placed on the methods of experimentation developed for studies in the range of thermal energies and slightly above.
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Journal of Electronics and Control, 1963
A simple ion source is described for producing a parallel beam of monoenergetic argon ions. A h-f discharge produces the ions and the beam is extracted through a lens system consisting of two apertures, with a grid in the aperture of the accelerating electrode. Beams can be produced up to 5 mA with diameter 2.5 cm and length 10 cm.
M. R. GAVIN, K. CHANDRA, L. J. LLOYD
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A simple ion source is described for producing a parallel beam of monoenergetic argon ions. A h-f discharge produces the ions and the beam is extracted through a lens system consisting of two apertures, with a grid in the aperture of the accelerating electrode. Beams can be produced up to 5 mA with diameter 2.5 cm and length 10 cm.
M. R. GAVIN, K. CHANDRA, L. J. LLOYD
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