VELOCITY DEPENDENCE OF CAPTURED-ELECTRON L-DISTRIBUTIONS IN LOW-ENERGY COLLISIONS OF AR(8+) WITH ATOMIC CS

We have measured the intensities of extreme ultraviolet (EUV) lines of the Ar VIII spectrum produced in collisions of Ar8+ ions (upsilon = 0 .13-0.40 a.u.) with atomic cesium and determined the relative populati ons of the orbital-angular-momentum subshells for an electron captured at 16- and 160-keV projectile energies. At 16 keV, the partial cross sections for capturing into low-l levels are larger than that for high -l levels, while, at 160 keV, only high-l levels are significantly pop ulated. The high-energy l distribution is in good agreement with Monte Carlo calculations of Pascale et al. [Phys. Rev. A 42, 5305 (1990)]. The experimental results at 16 keV are partly in qualitative agreement with a close coupling study of Harel and Jouin [J. Phys. B 21, 859 (1 988)].