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Impact-parameter dependence of electronic energy loss and straggling of incident bare ions on H and He atoms by using the coupled-channel method

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Impact-parameter dependence of electronic energy loss and straggling of incident bare ions on H and He atoms by using the coupled-channel method

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Título Impact-parameter dependence of electronic energy loss and straggling of incident bare ions on H and He atoms by using the coupled-channel method
Autor Grande, Pedro Luis
Schiwietz, Gregor
Abstract A first-principles calculation based on an expansion of the time-dependent electronic wave function in terms of atomic orbitals (coupled-channel method) has been applied to evaluate the impact-parameter dependence of the electronic energy loss and the fluctuation in energy loss of swift ions colliding on H and He atoms at energies of 10 to 500 keV/amu. The results have been compared with experimental data as well as with other existing models, e.g., the local-density approximation in an electron-gas target, the harmonic-oscillator target treatment, and the first-order plane-wave-Born approximation. Our results show a nearly exponential shape of the mean electronic energy loss for small impact parameters, in contrast to the Cxaussian shapes obtained by Mikkelsen and Sigmund
Contido em Physical review. A, Atomic, molecular, and optical physics. New York. Vol. 44, no. 5 (Sept. 1991), p. 2984-2992
Assunto Perda de energia de particulas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104176
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