Results 261 to 270 of about 9,838,945 (304)

Electron-impact excitation of atomic oxygen

Physical Review A, 1988
A close-coupling approximation is employed to theoretically investigate the excitation of the 3s3S0 and 3p3P states of atomic oxygen for electron impact energies ranging from 13.87-100 eV. The target states included in the expansion of the total wave function are modeled by accurate configuration-interaction wave functions.
, Tayal, , Henry
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Electron-impact excitation of heliumlike titanium

Physical Review A, 1995
We report theoretical close-coupling calculations for electron-impact excitation cross sections of He-like Ti XXI ions using the R-matrix method, including relativistic and radiation damping effects. The cross sections are in good agreement with experimental measurements from the electron-beam ion trap [Chantrenne et al., Phys. Rev. Lett. 69, 265 (1992)
, Zhang, , Pradhan
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Electron-impact excitation of Na

Physical Review A, 1988
Total and resonance electron-impact cross sections are obtained for Na in six-state (6CC) and four-state close-coupling (4CC) approximations for the electron energy range 3.5less than or equal toEless than or equal to150 eV. Accurate configuration-interaction target wave functions are employed to represent the ground state 3 /sup 2/S and the excited ...
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Electron-impact excitation of Ti x

Physical Review A, 1987
The absolute intensities of Ti X spectral lines emitted from a theta-pinch plasma are measured with a 2.2-m grazing-incidence monochromator which is calibrated in situ by using the branching-ratio technique. An electron temperature of 50 eV and an electron density of 2.2 x 10/sup 16/ cm/sup -3/ of the plasma are determined from the laser scattering ...
, Datla, , Roberts, , Mann
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Electron-impact excitation of excited atomic barium

Physical Review A, 2002
We present results of integral-excitation and total-ionization cross section calculations from the $6s6p{}^{1}{P}_{1},$ $6s5d{}^{1}{D}_{2},$ $6s6p{}^{3}{P}_{0,1,2},$ and $6s5d{}^{3}{D}_{1,2,3}$ states of Ba. The unitarized first-order many-body theory and the close-coupling method were used to obtain the integrated cross sections, while the Born ...
D. V. Fursa, I. Bray, G. Csanak, R. E. H. Clark, J. Abdallah, I. Kanik, S. Trajmar   +6 more
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Core excitation of Li by electron impact

Physical Review A, 1985
Cross sections for the excitation of a core electron, which leads to autoionization, in lithium (Li) atomic system by electron impact have been calculated with use of the single-configuration Hartree-Fock wave function within the asymptotic Green's-function approximation (AGFA) in the low-bombarding-energy region.
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Electron-impact excitation of lithium

Physical Review A, 2001
The results of R-matrix with pseudostates (RMPS) and time-dependent close-coupling (TDCC) calculations of electron-impact excitation in Li are presented. We included 55 terms in the RMPS close-coupling expansion, of which nine are spectroscopic and 46 are pseudostates.
D. C. Griffin, D. M. Mitnik, J. Colgan, M. S. Pindzola   +3 more
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The excitation of He+ by electron impact

Journal of Physics B: Atomic and Molecular Physics, 1969
The wave function of the e--He+ system is expanded as a sum of close-coupling states together with a number of short-range correlation terms. The scattering matrix is evaluated in the energy range between the n = 2 and n = 3 thresholds. The convergence of the expansion of the wave function is discussed and comparison is made with recent experiments for
P G Burke, A Joanna Taylor
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Electron impact excitation of beryllium

Journal of Physics B: Atomic, Molecular and Optical Physics, 1996
Results from an R-matrix with pseudo-states (RMPS) calculation are presented for electron impact excitation of the transitions in beryllium for incident energies from threshold up to 5 Ryd. At energies above the ionization threshold (0.685 Ryd), the representation of target continuum states is found to be crucial for accurate results to be obtained. A
K Bartschat, P G Burke, M P Scott
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Electron-impact excitation of boron

Journal of Physics B: Atomic, Molecular and Optical Physics, 1997
Results from an R-matrix with pseudo-states (RMPS) calculation are presented for electron-impact excitation of the and transitions in neutral boron for incident energies from threshold up to 3 Ryd. At energies above the ionization threshold (0.61 Ryd), the inclusion of target continuum states in the close-coupling expansion is found to be crucial for
Pascale J Marchalant, Klaus Bartschat, Keith A Berrington, Shinobu Nakazaki   +3 more
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