Results 261 to 270 of about 9,838,903 (305)

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 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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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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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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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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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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