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The possibility of a complete determination of the scattering amplitudes for a D state produced by a collisionally induced coherent S to D excitation is investigated. A polarisation analysis of the subsequent D to P dipole transition by the photon-particle coincidence method is not sufficient to completely determine the excitation amplitudes for the D state. Additional information can be obtained from collision experiments performed in the presence of symmetry-breaking electromagnetic fields. In the case of Li(3d 2 D), the combined action of an external magnetic field and the spin-orbit coupling has been utilised. The results of the first coincident level crossing experiment is reported, allowing an unambiguous determination of the excitation amplitudes for the Li(3d 2 D) state produced in Li-He collisions.
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Neitzke et al. (1984) studied this question.
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