Date of Award

4-2014

Degree Name

Master of Arts

Department

Physics

First Advisor

Dr. Emanuel Kamber

Second Advisor

Dr. Ahsgar Kayani

Third Advisor

Dr. Dean Halderson

Keywords

Atomic, physics, electron, capture, ions

Access Setting

Masters Thesis-Open Access

Abstract

State-selective differential cross sections for single-electron capture processes in collisions of Neq+ (q=2, 3, 5) ions with H2O and CO2 have been studied experimentally at laboratory collisions energies between 45 and 250 eV, and at scattering angles between 0o and 7:20o by means of translational energy-gain spectroscopy technique. The translational energy spectra show that only a few final states are populated depending on the projectile's charge state, laboratory scattering angle, and the collision energy. In addition, these measurements show that the dominant reaction channels are due to non-dissociative electron capture into excited states of the projectile product Ne(q-1)+. Contributions from capture accompanied by the excitation of the target product are also observed. Furthermore, reaction channels have been observed which indicate the presence of the long-lived metastable states of Ne2+ in the incident beam. The energygain spectra are qualitatively interpreted in terms of the reaction windows, which are calculated using the single-crossing Landau-Zener model (LZ) and the extended version of the classical over barrier model (ECOB). The energy dependence of cross sections for single-electron capture by Ne2+ ions from H2O and CO2 are also measured and are found to slowly increase with the collision energy.

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