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|Type:||Artigo de periódico|
|Title:||Electronic Excitation Of H 2 By Positron Impact: An Application Of The Schwinger Multichannel Method|
|Abstract:||In this paper we report integral and differential cross sections for positron-impact excitation of the X 1 Σ g + → B 1 Σ u + transition in H 2 for collision energies of 13.5, 15, 17.5, 20, 25 and 30 eV. These cross sections were derived from fixed-nuclei scattering amplitudes in such a way that low angular-momentum components are obtained using the Schwinger multichannel method and the large ones are treated by the first Born approximation. To our knowledge, up to date no experimental data are available for comparison. Our results differ from previous theoretical results of Mukherjee and co-workers (1991). We discuss possible reasons for this disagreement. © 1994 1OP Publishing Ltd.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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