Results 271 to 280 of about 6,243,018 (311)
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Electron-impact-ionization cross sections of the Ga and In atoms
Physical Review A, 1989Absolute electron-impact cross sections for single, double, and triple ionization of gallium and indium have been measured from 0 to 200 eV. Beams of Ga and In atoms are formed by charge-transfer neutralization of 3-keV-ion beams with triethylamine or xenon.
, Shul, , Wetzel, , Freund
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Photoionization cross section and resonance structure of atomic yttrium
Physical Review A, 1987Many-body perturbation theory has been used to calculate the photoionization cross section of neutral yttrium from threshold at 6.52--100.0 eV. The resonance structure due to 4p excitations to 4d states has also been calculated. Hartree-Fock results are also presented for comparison.
, Wijesundera, , Kelly
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Positron-atom doubly differential ionization cross sections
Physical Review A, 1994Doubly differential ionization cross sections for positron impact on argon atoms were determined by energy- and angle-resolved measurements of ejected electrons in time correlation with the produced ions. Corresponding measurements with incident electrons were made for comparison.
, Schmitt +4 more
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Electron-impact-ionization cross section for the hydrogen atom
Physical Review A, 1994A distorted-wave Born exchange approximation was used to calculate the cross section for electron-impact ionization of the hydrogen atoms. Both the integral and energy-differential cross section were calculated. The results were compared with the latest experimental data and other theoretical calculations.
, Hu, , Fang, , Wang, , Yang
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Atom-atom momentum-transfer cross section in the presence of resonances
Physical Review A, 1983The atom-atom momentum-transfer cross section is analyzed for low-energy collisions in which resonances may be present. It is shown that their contribution to this cross section can be substantial, and this is confirmed in the calculation on ${\mathrm{H}}^{+}$-He system.
S. Bosanac, K. Knešaurek
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Measurement of Differential Atomic Collision Cross Sections
Review of Scientific Instruments, 1971An 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
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A parametrisation of the atomic cross-section for pair production
Physics in Medicine & Biology, 1982Reports a parametrisation of the atomic cross-section for electron-positron pair production, which makes possible the accurate calculation of photon attenuation coefficients over a very wide energy range.
null D F Jackson, null S Murugesu
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Photoionization cross section and resonance structure of atomic sulphur
Journal of Physics B: Atomic, Molecular and Optical Physics, 1992Many-body perturbation theory has been applied to calculate the partial and total photoionization cross sections for neutral sulphur from the first ionization threshold at 10.36 eV to 60 eV. The excitations from the ground state S(3s23p43P), leaving the residual S+ ions in the lowest five LS states (3s23p34S,2D,2P and 3s3p44p,2p), are considered.
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On the dependence of electron scattering cross-section of atoms on their atomic number
Die Naturwissenschaften, 1962A comparison is made of the experimental and theoretical values of the scattering cross sections of C, Al, and Pd to determine if the cross section depends on the atomic number. It is observed that the experimental values increase with atomic number. (J.S.R.)
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Calculation of Atom–Atom Excitation Cross Sections by Classical Methods
The Journal of Chemical Physics, 1969Atom-atom collisional excitation cross sections obtained from ionization cross sections, noting Thomson classical ...
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