Polarização do alvo molecular no espalhamento de eletrons / Polarization of molecular target in electron scattering

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this work is the inclusion of polarization effects in the calculations of scattering cross section by using model potentials. The implementation was made in the Schwinger multichannel method with pseudopotentials, using a description of polarization potential with gaussians functions. With this potential we entend to reduce the computational cost present in the inclusion of polarization effects through ab-initio calculation. We use three potentials that can be found in the literature. The first potential relates the short range effect (correlation) derivated from a free electron gas model, with the long range effect (polarization). The second potential has the simplest form, for radius close to zero the potential tends to a constant, and for large r it decays like a polarization potential. The third potential has a exponential factor that is zero in the origin and it decays like a polarization potential for large r. We present a polarization model described by a displacement of a eletric charge density with a ab-initio calculated parameter. Using the third model potential we calculated the integral, momentum transfer and diferential cross section for CH4, SiH4, GeH4, PbH4, SnH4, CF4and Si F4molecules. Our results had been compared with experimental data and we have good agreement

ASSUNTO(S)

seção de choque (fisica nuclear) espalhamento (fisica) scattering (physics) eletrons cross sections (nuclear physics) electrons

ACESSO AO ARTIGO

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