Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen
We study the total cross section and angular distribution in Rayleigh scattering by hydrogen atom in the ground state, within the framework of Dirac relativistic equation and second-order perturbation theory. The relativistic states used for the calculations are obtained by making use of the finite...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
9 April 2012
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| In: |
Physical review. A, Atomic, molecular, and optical physics
Year: 2012, Volume: 85, Issue: 4 |
| ISSN: | 1094-1622 |
| DOI: | 10.1103/PhysRevA.85.043406 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevA.85.043406 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.85.043406 |
| Author Notes: | L. Safari, P. Amaro, S. Fritzsche, J. P. Santos, and F. Fratini |
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| 520 | |a We study the total cross section and angular distribution in Rayleigh scattering by hydrogen atom in the ground state, within the framework of Dirac relativistic equation and second-order perturbation theory. The relativistic states used for the calculations are obtained by making use of the finite basis-set method and expressed in terms of B splines and B polynomials. We pay particular attention to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction. It is shown that the angular distribution of scattered photons, while symmetric with respect to the scattering angle θ=90∘ within the electric dipole approximation, becomes asymmetric when higher multipoles are taken into account. The analytical expression of the angular distribution is parametrized in terms of Legendre polynomials. Detailed calculations are performed for photons in the energy range 0.5 to 10 keV. When possible, results are compared with previous calculations. | ||
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