Abstract
We have measured the alignment and orientation parameters of the2F 7 2/0 and2F 5 2/0 states of Ar+ formed in the two-electron process; He++Ar→He(1s2)+Ar+(3p44p′). These have been measured at a collision energy of 0.25 keV/amu and for scattering angles ranging from 0.94° to 3.75°. First, by comparing the orientation parameter for the Ar+[(3p4[1D]4p′2F 7 2/0 ] and the Ar+[(3p4[1D]4p′2F 5 2/0 ] states, we have experimentally determined the importance of the spin-dependent interactions for the present collision system, by testing the Percival-Seaton hypothesis of spin independence. If the Percival-Seaton hypothesis holds for this system, the orientation parameter should beJ-independent. Secondly, the magnitude of the orientation parameter can be interpreted as resulting from the collective circulation of the unexcited 3p4 electrons and the excited 4p electron. The direction of this collective circulation is compared to the propensity rule for colliding di-atom systems.
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