Dissertation/Thesis Abstract

Toward Rotational Cooling of Trapped SiO+ by Optical Pumping
by Tabor, David, Ph.D., Northwestern University, 2014, 96; 3627205
Abstract (Summary)

This thesis presents a scheme for preparation of trapped molecular ions with a high degree of internal state purity by optical pumping with a broadband pulse-shaped femtosecond laser; the internal structure of SiO+ permits fast stepwise pumping through the tens of rotational levels populated in a room-temperature distribution. Two analyses, which guided the experimental implementation, are presented: (1) a novel method of quantifying anharmonicity in the trapping potentials, which limits the number of ions that can be trapped, and (2) a rate-equation simulation of the quantum state evolution during pumping. Experimental implementation of pulse shaping and its characterization are discussed, as is the molecular spectroscopy used to reference this light to the rotational cooling transitions. Internal state analysis can be performed using resonance enhanced multiphoton dissociation.

Indexing (document details)
Advisor: Odom, Brian
Commitee: Ketterson, John, Shahriar, Selim
School: Northwestern University
Department: Physics and Astronomy
School Location: United States -- Illinois
Source: DAI-B 75/10(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: High Temperature Physics, Quantum physics, Condensed matter physics
Keywords: Diatomic molecule, Ion trap, Laser, Laser cooling, Optical pumping
Publication Number: 3627205
ISBN: 978-1-321-02342-8
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