Fotoionização de atomos relativisticos / Photoionization of relativistic atoms
AUTOR(ES)
Maria Gloria de Oliveira Pinho
DATA DE PUBLICAÇÃO
2007
RESUMO
In this work we present photoionization results for the valence s-electrons of Sodium, Potassium, Rubidium and Cesium atoms including relativistic effects. In our calculations we consider the photoionization of a non-polarized atom by linearly polarized light, using half occupation transition states, within the electric dipole approximation and the Local Density Approximation. Our total photoionization cross sections and asymmetry parameters were calculated using relativistic wave functions obtained from Dirac?s equations. We show that the use of half occupation transition states improves the results, producing many advantages, such as numeric precision in the evaluation of the Ionization Potentials. We have also studied the in uence of the cross section minimum (Cooper Minimum) on the asymmetry parameters. We compare our results with experimental data and with other calculations from the literature
ASSUNTO(S)
minimo de cooper transition state cooper minimum asymmetry parameter parametro de assimetria fotoionização relativistica seção de choque relativistica estado de transição relativistic photoionization relativistic cross section
