PRODUCT-STATE DISTRIBUTIONS IN THE DISSOCIATIVE RECOMBINATION OF (HED-HE-3 AND (HEH+)-HE-4())

Asymptotic atomic-state branching ratios for the dissociative recombin ation of both (HeD+)-He-3 and (HeH+)-He-4 have been studied using the CRYRING and TSR heavy-ion storage rings. The kinetic-energy release in the recombination process was measured for incident electron energies between 0 and 15 eV. It was found that the He(1s(2))+D,H(n = 2) chann el completely dominates at zero electron energy. The branching ratios observed slightly above the threshold for the n = 3 state of the H (D) atom indicate a rapid switchover of the final-state population to thi s level. At collision energies above 10 eV many channels leading to ex cited He atoms are found to contribute, and also a strong angular anis otropy of the dissociation products is observed.