Results 221 to 230 of about 519,650 (267)

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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Charge densities and quasi-ions in lattice dynamics

Physical Review B, 1985
In the preceding paper we have proposed a decomposition of the total charge density of a crystal into contributions which can be uniquely assigned to the individual ions or sublattices. This decomposition leads naturally to a definition of ``quasi-ions'' and a description of the chemical bonds in terms of partial charge densities of the respective ions.
, Falter, , Selmke, , Ludwig, , Kunc
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Calibrating ion density profile measurements in ion thruster beam plasma

Review of Scientific Instruments, 2016
The ion thruster beam plasma is characterized by high directed ion velocity (104 m/s) and low plasma density (1015 m−3). Interpretation of measurements of such a plasma based on classical Langmuir probe theory can yield a large experimental error. This paper presents an indirect method to calibrate ion density determination in an ion thruster beam ...
Zun Zhang, Haibin Tang, Junxue Ren, Zhe Zhang, Joseph Wang   +4 more
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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 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-induced densification of pvd films-a choice of the optimum density of ion bombardment

Applied Physics A: Materials Science & Processing, 1996
The densification process by ion-assisted physical vapour deposition of films is considered as a consequence of rearrangement of atoms in the near-surface film layer. A model is proposed allowing the quantitative estimate of the optimum ion current density required to produce a film with maximum density.
Grigorov, G.I., Grigorov, K.G., Sporken, Robert, Caudano, Roland   +3 more
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Ion-density measurements in the stratosphere

Journal of Geophysical Research, 1960
The number density of small negative ions in the atmosphere was measured in 1958 on a series of eight balloon flights which reached altitudes of 115,000 feet over Minneapolis (45°N). A pronounced decrease in the number density of small negative ions was observed at the tropopause on seven of the eight flights, and similar decreases were observed at ...
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Enhancement of the Ion Current Density in Magnetically Insulated Ion Diodes

Japanese Journal of Applied Physics, 1981
An experiment on magnetically insulated ion diodes using a surface flashover anode is presented. The ion current density increased upon increasing the anode surface of the flashover source, and varied with the applied magnetic field. Enhancement of the ion current density by a factor of 3–4 occurs for an applied magnetic field of B
Shuji Miyamoto, Tetsu Ozaki, Kazuo Imasaki, Satoshi Higaki, Sadao Nakai, Chiyoe Yamanaka   +5 more
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Effects of coherent density fluctuations on the ion–ion hybrid resonance

Physics of Fluids B: Plasma Physics, 1990
An analytic and numerical study is made of the effects caused by coherent density fluctuations, localized near the ion–ion hybrid resonance, on the propagation and absorption of fast Alfvén waves. The system is represented by a Budden equation that incorporates static fluctuations in the ion density profiles. The unperturbed system contains a resonance
H. Romero, G. J. Morales
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Self-consistent versus experimental densities in the ion-ion potential derived using the energy density formalism

Nuclear Physics A, 1992
Abstract We have used the energy density formalism together with Skyrme forces to build up the real part of the ion-ion potential. We have analysed the elastic scattering data for the 40 Ca+ 40 Ca reaction at several bombarding energies including a phenomenological imaginary part.
A. Guirao, X. Viñas, J. Díaz
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