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|Type:||Artigo de periódico|
|Title:||Cross sections for rotational excitations of CH4, SiH4, GeH4, SnH4 and PbH4 by electron impact|
|Abstract:||We report differential and integral cross sections for rotational excitation of XH(4) molecules (X: C, Si, Ge, Sn, Pb) from 7.5-30 eV by electron impact. These cross sections were derived from fixed-nuclei scattering amplitudes (Bettega et al. 1995) obtained using the Schwinger Multichannel Method with Pseudopotentials (SMCPP) (Bettega et al. 1993). Our results represent the first rotational excitation cross sections for molecules as large as GeH4, SnH4 and PbH4 using entirely ab initio procedures. The cross sections for CH4 and SiH4 obtained with pseudopotentials are in very good agreement with all-electron calculations and with other theoretical results. A comparison between our calculated cross sections and experimental data for CH4 is in general encouraging, but some discrepancies remain. We found inelastic rotational cross sections and momentum transfer cross sections to be larger for SiH4, GeH4, SnH4 and PbH4 than for CH4. We could explain this feature.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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