Abstract
The atomic orientation J⊥+generated by polarized-electron impact excitation of Pb(6p2)3P0 → (6p7s)3P1is studied experimentally using the electron–photon coincidence technique.For the decay transition (6p7s)3P1 → (6p2)3P2,the connection between the polarization components of theemitted photons and the coherence parameters J⊥+,Pl+,γ,h is given.J⊥+shows a significant dependence on the spin projection of the incidentelectrons with an energy of 6 eV. The experimental results are comparedwith theoretical predictions from a semi-relativistic Breit–PauliR-matrixmodel and the relativistic distorted-wave approximation and are interpreted withregard to well-established orientation propensity rules. The experimental datashow, in agreement with the calculation and the prediction made by asemi-classical trajectory model, that the propensity rules hold for the excitation ofthe relatively heavy lead atom.
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