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Gurevich, Yulia Vsevolodovna

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Gurevich

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Yulia Vsevolodovna

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Gurevich, Yulia Vsevolodovna

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2010 - 20113

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Author's Publications: search.filters.isAuthorOfPublication.2656245b-e596-4574-858c-c1b437a4c2a6

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Now showing 1 - 3 of 3
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    A Cryogenic Beam of Refractory, Chemically Reactive Molecules with Expansion Cooling
    (Royal Society of Chemistry, 2011) Hutzler, Nicholas; Parsons, Maxwell Fredrick; Gurevich, Yulia Vsevolodovna; Hess, P; West, Elizabeth Petrik; Spaun, Ben; Vutha, Amar; DeMille, David; Gabrielse, Gerald; Doyle, John
    Cryogenically cooled buffer gas beam sources of the molecule thorium monoxide (ThO) are optimized and characterized. Both helium and neon buffer gas sources are shown to produce ThO beams with high flux, low divergence, low forward velocity, and cold internal temperature for a variety of stagnation densities and nozzle diameters. The beam operates with a buffer gas stagnation density of \(\sim 10^{15}-10^{16}\) cm\(^{-3}\) (Reynolds number \(\sim 1-100\)), resulting in expansion cooling of the internal temperature of the ThO to as low as 2 K. For the neon (helium) based source, this represents cooling by a factor of about 10 (2) from the initial nozzle temperature of about 20 K (4 K). These sources deliver \(\sim 10^{11}\) ThO molecules in a single quantum state within a 1-3 ms long pulse at 10 Hz repetition rate. Under conditions optimized for a future precision spectroscopy application [A C Vutha et al 2010 J. Phys. B: At. Mol. Opt. Phys. 43 074007], the neon-based beam has the following characteristics: forward velocity of 170 m/s, internal temperature of 3.4 K, and brightness of \(3 \times 10^{11}\) ground state molecules per steradian per pulse. Compared to typical supersonic sources, the relatively low stagnation density of this source, and the fact that the cooling mechanism relies only on collisions with an inert buffer gas, make it widely applicable to many atomic and molecular species, including those which are chemically reactive, such as ThO.
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    Search for the Electric Dipole Moment of the Electron with Thorium Monoxide
    (Institute of Physics, 2010) Campbell, Wesley; DeMille, David; Vultha, Amar; Gurevich, Yulia Vsevolodovna; Hutzler, Nicholas; Parsons, Maxwell Fredrick; Patterson, David; West, Elizabeth Petrik; Spaun, Ben; Gabrielse, Gerald; Doyle, John
    The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the Standard Model. We describe an ongoing experiment to measure or set improved limits to the eEDM, using a cold beam of thorium monoxide (ThO) molecules. The metastable \(H\) \(^{3}\)\(\Delta\)\(_{ 1}\) state in ThO has important advantages for such an experiment. We argue that the statistical uncertainty of an eEDM measurement could be improved by as much as 3 orders of magnitude compared to the current experimental limit, in a first-generation apparatus using a cold ThO beam. We describe our measurements of the \(H\) state lifetime and the production of ThO molecules in a beam, which provide crucial data for the eEDM sensitivity estimate. ThO also has ideal properties for the rejection of a number of known systematic errors; these properties and their implications are described.
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    Magnetic and Electric Dipole Moments of the \(H\ ^3\Delta_1\) State in ThO
    (American Physical Society, 2011) Vutha, Amar; Spaun, Ben; Gurevich, Yulia Vsevolodovna; Hutzler, Nicholas; Kirilov, E; Doyle, John; Gabrielse, Gerald; DeMille, David
    The metastable \(H\ ^3\Delta_1\) state in the thorium monoxide (ThO) molecule is highly sensitive to the presence of a CP-violating permanent electric dipole moment of the electron (eEDM). The magnetic dipole moment \(\mu_H\) and the molecule-fixed electric dipole moment \(D_H\) of this state are measured in preparation for a search for the eEDM. The small magnetic moment \(\mu_H = 8.5(5) \times 10^{-3}\ \mu_B\) displays the predicted cancellation of spin and orbital contributions in a \(^3\Delta_1\) paramagnetic molecular state, providing a significant advantage for the suppression of magnetic field noise and related systematic effects in the eEDM search. In addition, the induced electric dipole moment is shown to be fully saturated in very modest electric fields (\(<\) 10 V/cm). This feature is favorable for the suppression of many other potential systematic errors in the ThO eEDM search experiment.