Results 271 to 280 of about 9,838,945 (304)

Electron impact on excited helium

Journal of Physics B: Atomic, Molecular and Optical Physics, 1998
Differential cross sections, integrated cross sections and ionization cross sections for electron scattering on the metastable level of helium are calculated at intermediate energies and compared with experimental measurements and other theoretical calculations.
Y Zhou, K Ratnavelu, Z Zhong, I E McCarthy   +3 more
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Excitation of naphthalene by electron impact

Journal of Physics B: Atomic, Molecular and Optical Physics, 1992
Absolute, apparent cross sections for 295-410 nm band emission from naphthalene have been measured over an electron-impact energy range from threshold to 300 eV. Numerous processes, including electron exchange, are observed to contribute to the excitation in the near threshold region.
J W McConkey, S Trajmar, K F Man, J M Ratliff   +3 more
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Electron impact excitation of coronene

The Journal of Chemical Physics, 1990
A preliminary study of the electron-impact excitation of thermally evaporated coronene at 550° C was carried out using electron-energy-loss spectroscopy. Measurements of the energy-loss spectra of coronene at high (100 eV) and low (5–20 eV) impact energies are presented. One of the high-energy spectra was converted to an apparent generalized oscillator
M. A. Khakoo, J. M. Ratliff, S. Trajmar
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Electron impact excitation of methane

The Journal of Chemical Physics, 1983
Electron energy-loss spectra covering the elastic and inelastic region up to 15.0 eV were obtained at 20, 30, and 200 eV impact energies at scattering angles ranging from 8° to 130°. Relative differential elastic scattering cross sections were determined at each impact energy and then, normalized to the absolute scale by utilizing the 100° differential
L. Vuškovic̀, S. Trajmar
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Excitation of Nv by electron impact

Journal of Physics B: Atomic and Molecular Physics, 1974
Collision strengths for electron impact excitation of Nv at an incident energy of 6.0 Ryd are calculated in a number of close-coupling approximations. Coupling effects are found to be more important than exchange effects for the 2s-3p transition which result in a close-coupling collision strength 40% larger than that calculated in a distorted wave ...
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Electron-impact excitation and ionization of

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997
We present results from R-matrix with pseudo-states (RMPS) and convergent close-coupling (CCC) calculations for electron-impact excitation from and direct ionization of the ground state of the ion. Comparison of the CCC and RMPS results with those from first-order distorted-wave calculations as well as simpler close-coupling calculations, with only ...
Pascale J Marchalant, Klaus Bartschat, Igor Bray   +2 more
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Electron impact excitation of water

Journal of Physics B: Atomic, Molecular and Optical Physics, 1998
The R-matrix method is used to calculate electron scattering cross sections for the excitation of four low-lying electronically excited states of the water molecule. These states, of symmetry , , and , have vertical excitation energies in the range 7-10 eV and are known to be dissociative.
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Excitation of Atoms by Electron Impact

Journal of the Physical Society of Japan, 1968
Excitation of atoms by electron impact is investigated theoretically with use of the total angular momentum representation. The mathematical method described in the author's previous paper is used. The exchange effect is neglected throughout the paper. A new cross-section formula is derived in the two-state approximation.
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Electron-impact excitation of carbon

Physical Review A, 2005
The $B$-spline $R$-matrix method is used to investigate the electron-impact excitation of neutral carbon over an energy range from threshold to $60\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. A multiconfiguration Hartree-Fock method with nonorthogonal orbitals is employed to generate an accurate representation of the target wavefunctions. The present close-
Oleg Zatsarinny, Klaus Bartschat, Ludmila Bandurina, Viktor Gedeon   +3 more
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Excitation of Helium by Electron Impact

Physical Review A, 1973
Excitation of helium atoms by electron impact is studied for intermediate- and high-energy electrons. Calculations of the differential cross sections for the 1S - 2 /sup 1/S transition are made by use of a one-dimensional integral representation of the scattering amplitude obtained in the Glauber approximation.
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