Abstract
The authors have studied the simultaneous excitation of both collision partners to the 21P state in He-He collisions at 1250 eV. This was done by measuring (in a coincidence experiment) the angular correlations between the two UV photons emitted by the two simultaneously excited atoms in their decay to the ground state. These measurements contain information on the cross sections for simultaneous 21P excitation of the two colliding atoms to the various substate combinations. A theoretical expression for the angular correlation function in terms of the various collision parameters is presented and is used to extract the available information from the experimental data. The results are not in agreement with conclusions which can be drawn from a simple reasoning based on the correlation diagram for the He-He system.
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