Results 141 to 150 of about 802,471 (226)

Electron Ionization Cross Sections for Atomic Subshells

Microscopy and Microanalysis, 2003
Ionization of atoms is the first step in many analytical procedures. The cross section for ionizing a particular atomic shell is essential for calculating the magnitude of analytical signals. Calculations using atomic wave functions for various shells of all elements relevant for X-ray microanalysis over a range of electron energies up to 400 keV ...
openaire   +2 more sources

Photoionisation cross section of atomic oxygen

Journal of Physics B: Atomic and Molecular Physics, 1978
The photoionisation cross section for the ground state 2s22p4 3P of O I is calculated in the close-coupling approximation employing the frozen-cores model. Results include detailed resonance analysis using accurate interpolation and extrapolation procedures.
openaire   +1 more source

Ion-Rydberg atom collision cross sections

Journal of Physics B: Atomic and Molecular Physics, 1980
Classical-trajectory Monte Carlo calculations have been performed for collisions of ions in charge states q=+1, +2, +5 and +10 with hydrogenic atoms in principal quantum levels n=1, 2, 5, 10 and 20. The collision velocity range investigated was 1 or=2.
openaire   +1 more source

Electron-impact cross sections for Cu atoms

Journal of Physics B: Atomic and Molecular Physics, 1977
Relative differential electron-impact cross sections have been measured for elastic scattering for excitation of the 3d104p 2 P1/2,3/2, 3d94s2 2D5/2 and 3d94s2 2D3/2 states of Cu at 6, 10, 20, 60 and 100 eV in the 0 degrees to 140 degrees angular range.
S Trajmar, W Williams, S K Srivastava
openaire   +1 more source

Investigation of γ-ray attenuation coefficients, effective atomic number and electron density for ZnO/HDPE composite

Physica Scripta, 2020
Bulk and nano ZnO/HDPE composite with different weight fractions (10, 20, 30 and 40%) of ZnO as a filler were prepared and studied for radiation shielding properties against γ-ray. The structural, morphological and functional properties of the composites
Z. Alsayed, M. Badawi, R. Awad, A. El-Khatib, A. Thabet   +4 more
semanticscholar   +1 more source

Measurement of Differential Atomic Collision Cross Sections

Review of Scientific Instruments, 1971
An apparatus for the study of differential angular scattering of atomic projectiles by gas targets is described. The design facilitates system alignment and provides for accurate reproducible location of components. The performance of the instrument is studied for scattering of H+ at 5–25 keV energies by helium and argon targets.
R. L. Fitzwilson, E. W. Thomas
openaire   +1 more source

Atomic Photoionization Cross Sections

1978
In these lectures I will discuss various methods of calculating atomic photoionization cross sections with emphasis on resonant structures. I will attempt to order the methods according to the complexity of the problem that they can be used on. Thus the Feshbach projection operator formalism, which is most applicable to the calculation of resonance ...
openaire   +1 more source

Atom–diatomic molecule kinetic theory cross sections

The Journal of Chemical Physics, 1985
Classical expressions for the generalized or kinetic theory cross sections for gases of diatomic molecules derived earlier are specialized to describe atom–diatomic molecules collisions and developed further. Numerical results based on parameters intended to describe Ar–N2 collisions are then presented and the resulting generalized cross sections are ...
C. F. Curtiss, M. W. Tonsager
openaire   +1 more source

Relativistic photoionization cross sections for atomic Mg

Journal of Physics B: Atomic, Molecular and Optical Physics, 2010
The photoionization cross sections of the ground level (3s(2) S-1(0)) of atomic Mg have been studied theoretically in the energy region between the Mg+(3s) and Mg+(3p) threshold using the fully relativistic R-matrix method. The positions and widths of resonances have also been obtained and compared with a recent experiment (Wehlitz et al 2007 J.
Guoli Wang, Jianjie Wan, Xiaoxin Zhou
openaire   +1 more source

SOME LOW-ENERGY ATOMIC STOPPING CROSS SECTIONS

Canadian Journal of Physics, 1965
The electronic stopping cross sections for protons in aluminum are reported in the energy interval 10 < E < 70 keV. Stopping cross sections below 150 keV in carbon targets for projectiles with [Formula: see text], and in aluminum targets for [Formula: see text] are reported also. The results are compared with theory and show reasonable agreement.
J. H. Ormrod, J. R. Macdonald, H. E. Duckworth   +2 more
openaire   +1 more source