By analyzing spectra of emitted photons, we have studied state-selective electron capture in collisions of He2+ on aligned Na*(3p) atoms that span the "velocity-matching" energy between projectile and target electron. We find a strong dependence of the capture cross sections on the Na*(3p) orbital alignment, i.e., aligned perpendicular or parallel to the ion beam direction. The preference changes from perpendicular to parallel at a velocity close to the classical orbital velocity of the 3p electron. Classical-trajectory Monte Carlo calculations reproduce this striking energy dependence. © 1993 The American Physical Society.
A. R. Schlatmann et al., "Strong Velocity Dependence Of Electron Capture In Collisions Between Aligned Na*(3p) And He2+," Physical Review Letters, vol. 71, no. 4, pp. 513 - 516, American Physical Society, Jan 1993.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.71.513
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01 Jan 1993