Date of Award


Degree Name

Master of Arts



First Advisor

Dr. E. Y. Kamber

Second Advisor

Dr. J. A. Tanis

Third Advisor

Dr. R. E. Shamu

Access Setting

Masters Thesis-Open Access


Doubly differential cross sections, in angle and energy, for state-selective single-electron capture from He and Ar by Ar4+ and Ar5+ ions have been studied experimentally at laboratory impact energies of 25q, 50q, and lOOq eV (q = 4 and 5, where q is the ion charge state) and at laboratory scattering angles between 0° and 5.5°, by means of translational energy spectroscopy. The translational energy-gain spectra show that only a few final states are selectively populated. Final-state transition probabilities were found to depend strongly on the charge state of the projectile ion and the ionization potential of the target atom, and only weakly on the impact energy. Multichannel Landau-Zener calculations correctly predict the positions of the dominant reaction channels that are observed and are in qualitative agreement with our measured cross sections.

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