Now showing items 1-20 of 69

    • Advanced cold molecule electron EDM 

      Campbell, Wesley; Chan, Cheong; DeMille, David; Doyle, John M.; Gabrielse, Gerald; Gurevich, Yulia; Hess, Paul; Hutzler, Nicholas Richard; Kirilov, Emil; O'Leary, Brendon; Petrik, Elizabeth; Spaun, Ben; Vutha, Amar (EDP Sciences, 2013)
      Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |de| < 1.05×10−27 e · cm would be an indication of physics beyond the Standard Model. The ...
    • Bright, guided molecular beam with hydrodynamic enhancement 

      Patterson, David; Doyle, John M. (AIP Publishing, 2007)
      The authors realize a novel high flux source of cold atoms and molecules employing hydrodynamic enhancement of an effusive aperture at cryogenic temperatures. Molecular oxygen from the source is coupled to a magnetic guide, ...
    • Buffer gas cooling and trapping of atoms with small effective magnetic moments 

      Harris, J. G. E; Michniak, R. A; Nguyen, S. V; Brahms, N; Ketterle, W; Doyle, John M. (IOP Publishing, 2004)
      We have extended buffer gas cooling to trap atoms with small effective magnetic moments µeff . For µeff ≥ 3µB, 1012 atoms were buffer gas cooled, trapped, and thermally isolatedin ultra high vacuum with roughly unit ...
    • Buffer gas loaded magneto-optical traps for Yb, Tm, Er and Ho 

      Hemmerling, Boerge; Drayna, Garrett Korda; Chae, Eunmi; Ravi, Aakash; Doyle, John M. (IOP Publishing, 2014)
      Direct loading of lanthanide atoms into magneto-optical traps (MOTs) from a very slow cryogenic buffer gas beam source is achieved, without the need for laser slowing. The beam source has an average forward velocity of 60– ...
    • Buffer-Gas Cooled Bose-Einstein Condensate 

      Doret, S. Charles; Connolly, Colin Bryant; Ketterle, Wolfgang; Doyle, John M. (American Physical Society, 2009)
      We report the creation of a Bose-Einstein condensate using buffer-gas cooling, the first realization of Bose-Einstein condensation using a broadly general method which relies neither on laser cooling nor unique atom-surface ...
    • Buffer-gas loading of atoms and molecules into a magnetic trap 

      Doyle, John; Friedrich, Bretislav; Kim, Jinha; Patterson, David (American Physical Society, 1995)
      We describe a method for loading paramagnetic atoms or molecules into a magnetic trap. A <sup>3</sup>He buffer gas is employed to thermalize atoms or molecules to a temperature of approximately 240 mK, lower than the depth ...
    • Cold N + NH Collisions in a Magnetic Trap 

      Hummon, Matthew T.; Tscherbul, Timur V.; Kłos, Jacek; Lu, Hsin-I; Tsikata, Edem; Campbell, Wesley C.; Dalgarno, Alexander; Doyle, John M. (American Physical Society (APS), 2011)
      We present an experimental and theoretical study of atom-molecule collisions in a mixture of cold, trapped N atoms and NH molecules at a temperature of 600 mK. We measure a small N þ NH trap loss rate coefficient of kðNþNHÞ ...
    • Cold 52Cr elastic and inelastic collision-rate determination using evaporative cooling analysis 

      Nguyen, Scott V.; deCarvalho, Robert; Doyle, John M. (American Physical Society (APS), 2007)
      Elastic and inelastic collision-rate constants of 52Cr in the temperature range of 20 mK to 1 K are inferred from the evaporative cooling of buffer gas loaded atomic chromium. Using a model that describes the dynamics of ...
    • Cold and Slow Molecular Beam 

      Lu, Hsin-I; Rasmussen, Julia; Wright, Matthew; Patterson, Dave; Doyle, John M. (Royal Society of Chemistry, 2011)
      Employing a two-stage cryogenic buffer gas cell, we produce a cold, hydrodynamically extracted beam of calcium monohydride molecules with a near effusive velocity distribution. Beam dynamics, thermalization and slowing are ...
    • A cold and slow molecular beam 

      Lu, Hsin-I; Rasmussen, Julia; Wright, Matthew; Patterson, Dave; Doyle, John M. (Royal Society of Chemistry (RSC), 2011)
      Employing a two-stage cryogenic buffer gas cell, we produce a cold, hydrodynamically extracted beam of calcium monohydride molecules with a near effusive velocity distribution. Beam dynamics, thermalization and slowing are ...
    • Cold Heteromolecular Dipolar Collisions 

      Sawyer, Brian C.; Stuhl, Benjamin K.; Yeo, Mark; Tscherbul, Timur V.; Hummon, Matthew T.; Xia, Yong; Klos, Jacek; Patterson, David; Doyle, John M.; Ye, Jun (Royal Society of Chemistry, 2011)
      Cold molecules promise to reveal a rich set of novel collision dynamics in the low-energy regime. By combining for the first time the techniques of Stark deceleration, magnetic trapping, and cryogenic buffer gas cooling, ...
    • Cold N + NH Collisions in a Magnetic Trap 

      Hummon, Matthew T.; Tscherbul, Timur V.; Klos, Jacek; Lu, Hsin-I; Tsikata, Edem; Campbell, Wesley C.; Dalgarno, Alexander; Doyle, John M. (American Physical Society, 2011)
      We present an experimental and theoretical study of atom-molecule collisions in a mixture of cold, trapped N atoms and NH molecules at a temperature of ∼600  mK. We measure a small N + NH trap loss rate coefficient of ...
    • Cold, Optically Dense Samples of Atomic Rubidium 

      Magkiriadou, Sofia; Patterson, David; Nicolas, Timothée; Doyle, John M. (Institute of Physics, 2011)
      Cold and optically dense gases of atomic rubidium are produced using buffer gas cooling in combination with rapid, high-flow vapor injection. The observed rubidium density is 3 × 10\(^{12}\)cm\(^{−3}\) at a gas temperature ...
    • Collision-Induced Spin Depolarization of Alkali-metal Atoms in Cold \(^3\)He Gas 

      Tscherbul, T.V.; Zhang, Peng; Sadeghpour, Hossein R.; Dalgarno, Alexander; Brahms, N.; Au, Yat Shan; Doyle, John M. (American Physical Society, 2008)
      We present a joint experimental and theoretical study of spin depolarization in collisions of alkali-metal atoms with \(^3\)He in a magnetic field. A rigorous quantum theory for spin-changing transitions is developed and ...
    • Collisional Properties of Cold Spin-Polarized Nitrogen Gas: Theory, Experiment, and Prospects as a Sympathetic Coolant for Trapped Atoms and Molecules 

      Tscherbul, Timur V.; Klos, Jacek; Dalgarno, Alexander; Zygelman, Bernard; Pavlovic, Zoran; Hummon, Matthew T.; Lu, Hsin-I; Tsikata, Edem; Doyle, John M. (American Physical Society, 2010)
      We report a combined experimental and theoretical study of collision-induced dipolar relaxation in a cold spin-polarized gas of atomic nitrogen (N). We use buffer gas cooling to create trapped samples of \(^{14}\)N and ...
    • Collisional relaxation of vibrational states of SrOH with He at 2 K 

      Kozyryev, Ivan; Baum, Louis William; Matsuda, Kyle Yoshio; Olson, Peter; Hemmerling, Boerge; Doyle, John M. (IOP Publishing, 2015)
      Vibrational relaxation of strontium monohydroxide (SrOH) molecules in collisions with helium (He) at 2 K is studied.We find the diffusion cross section of SrOH at 2.2 K to be σ =±× − d (5 2) 10 cm 14 2 and the vibrational ...
    • Cooling and Collisions of Large Gas Phase Molecules 

      Patterson, David; Tsikata, Edem; Doyle, John M. (Royal Society of Chemistry, 2010)
      Cold and dense samples of naphthalene \((C_{10}H_8)\) are produced using buffer gas cooling in combination with rapid, high flow molecule injection. The observed naphthalene density is \(n \approx 10^{11} cm_{−3}\) over a ...
    • Cooling, Collisions and non-Sticking of Polyatomic Molecules in a Cryogenic Buffer Gas Cell 

      Piskorski, Julia Hege (2014-10-21)
      We cool and study trans-Stilbene, Nile Red and Benzonitrile in a cryogenic (7K) cell filled with low density helium buffer gas. No molecule-helium cluster formation is observed, indicating limited atom-molecule sticking ...
    • A Cryogenic Beam of Refractory, Chemically Reactive Molecules with Expansion Cooling 

      Hutzler, Nicholas Richard; Parsons, Maxwell Fredrick; Gurevich, Yulia Vsevolodovna; Hess, Paul William; Petrik, Elizabeth Sarah; Spaun, Benjamin Norman; Vutha, Amar; DeMille, David; Gabrielse, Gerald; Doyle, John M. (Royal Society of Chemistry, 2011)
      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, ...
    • Deep superconducting magnetic traps for neutral atoms and molecules 

      Harris, J. G. E.; Michniak, R. A.; Nguyen, S. V.; Campbell, W. C.; Egorov, D.; Maxwell, S. E.; van Buuren, L. D.; Doyle, John M. (AIP Publishing, 2004)
      We describe the design, construction and performance of three realizations of a high-field superconducting magnetic trap for neutral atoms and molecules. Each of these traps utilizes a pair of coaxial coils in the ...