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Orientation Dependence for Multiple Electron Transfer from Homonuclear Diatomic Molecules in Collisions with Slow Highly Charged Ions

Orientation dependence is investigated for multiple electron transfer from homonuclear diatomic molecules in slow collisions with highly charged ions. Angular distributions of the molecular axis with respect to the incident beam are calculated for r-electron transfer (1 ≤ r ≤ 10) from nitrogen molecules with the three-center Coulombic over-barrier model developed by the present authors. The quadrupole anisotropy parameter β2 obtained indicates universal variation with the incident charge q; β2 ≃ – 1 at the threshold (i.e. q = r), taking the minimum of β2 ≃ – 0.1 at q ≃ r, and converging to β2 ≃ – 0.06 for q ≫ r. The present model generally derives oblate distributions (β2 < 0), in striking contrast to the statistical energy-deposition model, which gives prolate distributions (β2 > 0) for multiple ionization by fast-ion impact.