Dissociative ionization of spatially aligned D2 by fast highly charged ions

A.L. Landers, A. Al-Naser, J.A. Tanis
(Western Michigan University)

E. Wells
(University of Virginia)

T. Osipov, K.D. Carnes, I. Ben-Itzhak, C.L. Cocke
(Kansas State University)

Double ionization and ionization-excitation of D2 molecules by 19 MeV F8+ ions were studied using a COLTRIMS technique. Fast imaging detectors, a supersonically cooled gas jet, and the time focusing properties of the KSU LINAC (producing 400 ps pulses) are combined to fully measure the vector momenta of at least one molecule fragment and one electron produced in these ionizing collisions. Measurement of the fragment(s) yields alignment at the time of the collision as well as the final dissociative state of the molecular ion. Results indicate that the double-ionization cross section has an unexpectedly strong dependence on molecular orientation relative to the ion beam. Analysis is underway to investigate the influence of the two-center potential on the continuum electron as a function of molecule orientation and energy transferred from the projectile.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP 2002, May 2002 in Williamsburg, VA.

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