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Title: | Total cross section for the dissociative excitation of He-2(+) molecular ions in collision with He |
Authors: | Yousif, FB |
Issue Date: | 2002 |
Abstract: | Absolute cross sections have been determined for the dissociative excitation and electron capture followed by ion-pair formation (He++He-) for He-2(+) collisions with He in the energy range of 4-10 keV. The He+ absolute cross section that is uniquely due to the dissociative excitation was deduced, taking advantage of the measurements of the He- cross section. The center-of-mass energy for the fragment ions was measured. The available potential-energy curves show that the vibrationally excited ground state may be responsible for the fragment ions. The collisional deactivation of He-2(+) ions using high source pressure showed no effect on the measured cross section. Complete theoretical high-lying repulsive potential-energy curves for He-2(+) ions are currently not available, therefore it is not possible to quantitatively establish the final state of the ions. |
URI: | http://hdl.handle.net/11154/1837 |
ISSN: | 1050-2947 |
Appears in Collections: | Ciencias
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