Results 261 to 270 of about 1,568,609 (304)

Density enhancement in ion implanted polymers

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1987
Ion beam irradiation of polystyrene and polyimide films induces a strong densification of the starting material. The density increases to about 70% of the initial value after bombardment with heavy ions (Ar, Kr, Xe etc) in the energy range 25–250 key. The density change does not depend on the chemical structure and seems to be a general property of the
L. Calcagno, G. Foti
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Spin density in the CoCl42− ion

Chemical Physics Letters, 1980
Unrestricted and restricted Hartree-Fock calculations for the tetrachlorocobaltate(II) ion ICoCl42−) are presented. The spin density distributions from these calculations are compared with polarized neutron diffraction results through spin density plots and a population analysis.
Chandler, G.S., Phillips, R.
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Ion-ion recombination as a function of ion and gas densities

Chemical Physics Letters, 1981
Abstract We present a basic theory of the link between the low and high gas-density limits to ion-ion recombination under a general interaction V which now depends on the ion density and which is determined self-consistently with the recombination. Increase in ion density up to 10 14 cm −3 causes little change to the recombination rates in direct
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Visibility and small-ion density

Journal of Geophysical Research, 1966
The similarity of the light-scattering process to the process of ion attachment on airborne scatterers is examined. Under the assumption that particle concentration and size are the main factors influencing visibility and ion-density fluctuation in the lower atmosphere, it is shown by analysis that a correlation exists between electrical and optical ...
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Ion density variation effects in plasma source ion implantation

Surface and Coatings Technology, 2002
Plasma-source ion implantation (PSII) is a well-developed technique for introducing ions into a material specimen for enhancement of the surface properties. The technique is moving from the research to the industrial level, where specimens of large surface area need to be treated simultaneously.
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Ion density in electron beams

Physica, 1965
Abstract The charge trapped in electron or ion beams at pressures below breakdown may be determined from a general integro-differential equation. An approximation method to solve the latter is given. The method is particularly suitable for polynomials in x or in exp x . Some relevant exact solutions are considered.
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Ion densities in the night ionosphere

Planetary and Space Science, 1970
Nightime concentration profiles of O, NO and molecular oxygen ions in ionosphere calculated from daytime ...
Russel A. Howard, Joseph T. Vanderslice, S.G. Tilford   +2 more
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Spin Density in Pyrene Negative Ion

The Journal of Chemical Physics, 1961
Improved resolution has permitted assignment of all proton hyperfine coupling constants in pyrene negative ion. The results are accounted for by a simple calculation of configurational interaction.
G. J. Hoijtink, J. Townsend, S. I. Weissman   +2 more
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High Current Density Lithium Ion Source

2010
Induction linear accelerators are featured in accelerator-based research currently supported by the Office of Fusion Energy Sciences. Over the next few years, the research will concentrate on developing intense ion sources and on studying the physics of spatial compression, neutralized transport, and focusing of the beam.
Sah, Richard, Dudas, Alan, Kwan, Joe, Neubauer, Michael   +3 more
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High-current-density metal-ion implantation

Review of Scientific Instruments, 1992
Design features and preliminary performance data for an ion-implantation system that derives its broad, high-current-density beam directly from a steady, metal-plasma discharge in a high temperature graphite chamber are described. Metal vapor is supplied by drawing electron current to an anode-potential crucible to vaporize a pure metal in it.
Paul J. Wilbur, Ronghua Wei
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