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Scattering of laser-excited alkali-atoms from rare gas atoms: left/right asymmetry in the differential cross section

Rudolf Düren

Published Jan 1, 1985• 0 citations
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Orientation effects in the scattering of Na(3 2P3/2) and K(4 2P3/2) with rare gas targets at thermal energies

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The σ−/σ+ asymmetry in the scattering of excited Na(3 2P3/2) and K(4 2P3/2) atoms with oriented electronic angular momentum from rare gas targets has been systematically studied. The orientation is achieved by exciting the atoms with circularly polarized laser light, which is directed perpendicularly into the scattering plane. The origin of the asymmetry is discussed on the basis of the close coupling formalism. This reveals the centrifugal part of the interaction to be the only central reason. The asymmetry is observed for all of the different target gases studied (Ne, Ar, Kr, Xe). Quantitatively the observed features change strongly for the different combinations. Model calculations are presented which show the different fine-structure splitting of the alkali atom and the polarizability of the rare gas atoms to be responsible for the variation.

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The influence of coherence terms on the differential cross section for K(42P32)\mathrm{K}(4^{2}P_{\frac{3}{2}})K(42P23​​) interacting with Ar has been measured. The excitation with circularly polarized light directed perpendicularly to the scattering plane induces oscillations in the cross section for ${\ensuremath{\sigma}}^{+}$ light in contrast to ${\ensuremath{\sigma}}^{\ensuremath{-}}$. This asymmetry is verified by the measurement of the corresponding left-right asymmetry with respect to the scattering angle.
The σ−/σ+ asymmetry in the scattering of excited Na(3 2P3/2) and K(4 2P3/2) atoms with oriented electronic angular momentum from rare gas targets has been systematically studied. The orientation is achieved by exciting the atoms with circularly polarized laser light, which is directed perpendicularly into the scattering plane. The origin of the asymmetry is discussed on the basis of the close coupling formalism. This reveals the centrifugal part of the interaction to be the only central reason. The asymmetry is observed for all of the different target gases studied (Ne, Ar, Kr, Xe). Quantitatively the observed features change strongly for the different combinations. Model calculations are presented which show the different fine-structure splitting of the alkali atom and the polarizability of the rare gas atoms to be responsible for the variation.