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# Orientation dependence of N< sub> 2</sub> and O< sub> 2</sub> multiple ionization in slow and fast collisions with highly charged Xe-ions

D-33615, Bielefeld, Germany; CIRIL, 14070, Caen Cedex 05, France; Gesellschaft f€ u ur Schwerionenforschung (GSI), D-64291, Darmstadt, Germany

ABSTRACT The influence of the molecular orientation on the multiple ionization of N 2 and O 2 was studied in collisions with highly charged Xe-ions at velocities of 0.2–0.3 and %15 a.u. The applied technique is based on a position-and time-sensitive multi-particle detector which allows to determine the ionization cross-section as a function of the orientation of the molecular axis. At lower collision energies, e.g. in collisions with 360 keV Xe 18þ , no anisotropy was found, whereas in collisions with 770 MeV Xe 18þ significant orientation effects appear at higher degrees of ionization.

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### Keywords

770 MeV Xe 18þ significant orientation effects

applied technique

collisions

molecular axis

multiple ionization

position-and time-sensitive multi-particle detector

Xe-ions