Abstract
The probability and the amplitudes (λ,X-parameters) for exciting the magnetic sublevels of Mg+(3p) in collisions with Ar-atoms have been computed within the coupled-channel impact parameter approximation. An excitation mechanism is found which accounts for most of the pecularities observed in the energy and impact parameter dependence of theλ,X-parameters for this collision system: the σ3sMg+ orbital acquires 3d-character at internuclear distances ≲1.8 a.u. and by strong rotational coupling among the 3d-molecular orbitals in this region primarily the 3dπ MO becomes populated. The final distribution among the magnetic sublevels of Mg+(3p) is determined by the rotational coupling at intermediate and large internuclear distances (≧3 a.u.) between the σ3p and π3p magnetic substates of Mg+(3p).
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