Date of Award


Degree Name

Master of Arts



First Advisor

Dr. E. Y. Kamber

Second Advisor

Dr. J. A. Tanis

Third Advisor

Dr. S. M Ferguson

Access Setting

Masters Thesis-Open Access


A new differential energy-gain spectrometer with a movable parallel-plate electrostatic energy analyzer has been constructed and tested for the study of double differential (in energy and angle) cross sections for state-selective electron capture processes in collisions of low-energy multiply charged ions with atomic gases. The ion beam is produced by extracting recoil ions from a primary interaction region where these ions are generated in collisions between a neutral target gas and a fast fluorine beam from the WMU tandem Van de Graaff accelerator. An einzel lens is used to focus the ion beam extracted from the recoil-ion source into a 180o double-focusing magnet. After mass and charge selection, the desired ion beam is steered through a gas collision cell containing the target gas. Scattered ions are energy analyzed by a 45o parallel-plate electrostatic energy analyzer and detected with a channel electron multiplier. Here we describe the experimental apparatus for studying double differential cross-sections and discuss a few specific collision systems.