Abstract
Experimental cross sections for charge exchange between a negative ion (TCNQF{sub 4}{sup -}, perfluorinated tetracyanoquinodimethane anion) and a xenon atom to produce a dianion (TCNQF{sub 4}{sup 2-}) exhibit a delayed threshold and pronounced oscillations as a function of collision energy. These features are explained by a post-collision-interaction theory which includes phase interferences between the two final state surfaces involving the two Xe{sup +} fine structure levels. In support of this interpretation, charge-exchange cross sections between TCNQF{sub 4}{sup -} and sodium are found to smoothly decline as a function of energy from 5 to 100 keV.
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