Preliminary Measurements for an Electron EDM Experiment in ThO
Contributors: Gabrielse, Gerald; Doyle, John; Walsworth, Ronald
Published: 2012
Language: eng
Description: The ACME collaboration aims to measure the eEDM via Ramsey spectroscopy of a cryogenic beam of ThO molecules in their metastable H state. This thesis describes the launch of this new experimental effort. A set of diode lasers has been built to address all the necessary ThO transitions. The laser frequencies were stabilized to a stable reference laser via a Fabry-P&eacute;rot transfer cavity. A measurement of the magnetic dipole moment of the H state has been performed that is complementary to a previous measurement by the collaboration. This value is important for determining the sensitivity of the H state to magnetic fields, which can be a source of noise and systematic errors in the eEDM measurement. Experimental efforts to prepare the coherent superposition of the M=&plusmn;1 Zeeman sublevels in the H, J=1 state that is the starting point of the eEDM experiment using transitions to the G state resulted in a better understanding of transitions between &Omega;-doublet states in an electric field. This led to a new technique for normalizing out shot-to-shot fluctuations in the molecular beam flux, which has also been demonstrated experimentally.
Notes: Keywords: electron electric dipole moment, thorium monoxide.

Thesis Ph.D. Harvard University 2012