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O'Leary, Brendon

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O'Leary

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Brendon

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O'Leary, Brendon

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2013 - 20142

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Author's Publications: search.filters.isAuthorOfPublication.f592cf52-a091-482d-bdb7-6144a0bacba4

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    Zeeman interaction in ThO H 3𝜟1 for the electron electric-dipole-moment search
    (American Physical Society (APS), 2014) Petrov, A. N.; Skripnikov, L. V.; Titov, A. V.; Hutzler, Nicholas; Hess, P. W.; O'Leary, Brendon; Spaun, B.; DeMille, D.; Gabrielse, Gerald; Doyle, John
    The current limit on the electron’s electric dipole moment, |de| < 8.7 × 10−29 e cm (90% confidence), was set using the molecule thorium monoxide (ThO) in the J = 1 rotational level of its H 3𝜟1 electronic state [J. Baron et al., Science 343, 269 (2014)]. This state in ThO is very robust against systematic errors related to magnetic fields or geometric phases, due in part to its -doublet structure. These systematics can be further suppressed by operating the experiment under conditions where the g-factor difference between the doublets is minimized. We consider the g factors of the ThO H 3[delta]1 state both experimentally and theoretically, including dependence on doublets, the rotational level, and the external electric field. The calculated and measured values are in good agreement. We find that the g-factor difference between doublets is smaller in J = 2 than in J = 1 and reaches zero at an experimentally accessible electric field. This means that the H,J = 2 state should be even more robust against a number of systematic errors compared to H,J = 1.
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    Shot-noise-limited spin measurements in a pulsed molecular beam
    (American Physical Society (APS), 2013) Kirilov, E.; Campbell, W. C.; Doyle, John; Gabrielse, Gerald; Gurevich, Y. V.; Hess, P. W.; Hutzler, Nicholas; O'Leary, Brendon; Petrik, E.; Spaun, B.; Vutha, A. C.; DeMille, D.
    Heavy diatomic molecules have been identified as good candidates for use in electron electric dipole moment (eEDM) searches. Suitable molecular species can be produced in pulsed beams, but with a total flux and/or temporal evolution that varies significantly from pulse to pulse. These variations can degrade the experimental sensitivity to changes in the spin precession phase of an electrically polarized state, which is the observable of interest for an eEDM measurement. We present two methods for measurement of the phase that provide immunity to beam temporal variations, and make it possible to reach shot-noise-limited sensitivity. Each method employs rapid projection of the spin state onto both components of an orthonormal basis. We demonstrate both methods using the eEDM-sensitive H 3[delta]1 state of thorium monoxide, and use one of them to measure the magnetic moment of this state with increased accuracy relative to previous determinations.