Now showing items 1-11 of 11

    • 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 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 ...
    • 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 ...
    • Magnetic Trapping of Atomic Nitrogen (\(^{14}\)N) and Cotrapping of NH (\(X\)\(^{3}\)\(\Sigma\) -) 

      Hummon, Matthew; Campbell, Wesley; Lu, Hsin-I; Tsikata, Edem; Wang, Yihua; Doyle, John M. (American Physical Society, 2008)
      We observe magnetic trapping of atomic nitrogen (\(^{14}\)N) and cotrapping of ground state imidogen (\(^{14}\)NH, \(X\)\(^{3}\)\(\Sigma\) -). Both are loaded directly from a room temperature beam via buffer gas cooling. ...
    • Magnetic trapping of atomic nitrogen (^14N) and cotrapping of NH (X-triplet-Sigma-) 

      Hummon, Matthew T.; Campbell, Wesley C.; Lu, Hsin-I; Tsikata, Edem; Wang, Yihua; Doyle, John M. (American Physical Society (APS), 2008)
      We observe magnetic trapping of atomic nitrogen (N14) and cotrapping of ground-state imidogen (N14H, XΣ−3). Both are loaded directly from a room-temperature beam via buffer gas cooling. We trap approximately 1×1011 N14 ...
    • Magnetic trapping of molecules via optical loading and magnetic slowing 

      Lu, Hsin-I (2014-02-25)
      This thesis demonstrates a new cooling and trap loading technique for molecules, leading to trapping of calcium monofluoride (CaF).
    • Magnetic Trapping of NH Molecules with 20 s Lifetimes 

      Tsikata, E.; Campbell, W. C.; Hummon, M. T.; Lu, Hsin-I; Doyle, John M. (Institute of Physics, 2010)
      Buffer gas cooling is used to trap NH molecules with 1/e lifetimes exceeding 20 s. Helium vapor generated by laser desorption of a helium film is employed to thermalize 10\(^5\) molecules at a temperature of 500 mK in a ...
    • Mechanism of Collisional Spin Relaxation in \(^3\)Σ Molecules 

      Campbell, Wesley C.; Tscherbul, Timur V.; Lu, Hsin-I; Tsikata, Edem; Krems, Roman V.; Doyle, John M. (American Physical Society, 2009)
      We measure and theoretically determine the effect of molecular rotational splitting on Zeeman relaxation rates in collisions of cold \(^3\)Σ molecules with helium atoms in a magnetic field. All four stable isotopomers of ...
    • Spin-Orbit Suppression of Cold Inelastic Collisions of Aluminum and Helium 

      Connolly, Colin Bryant; Au, Yat Shan; Chae, Eunmi; Tscherbul, Timur V.; Buchachenko, Alexei A.; Lu, Hsin-I; Ketterle, Wolfgang; Doyle, John M. (American Physical Society (APS), 2013)
      We present a quantitative study of suppression of cold inelastic collisions by the spin-orbit interaction. We prepare cold ensembles of \(>10^{11} Al(^2P_{1/2})\) atoms via cryogenic buffer-gas cooling and use a single-beam ...
    • Time-Domain Measurement of Spontaneous Vibrational Decay of Magnetically Trapped NH 

      Campbell, Wesley; Groenenboom, Gerrit; Lu, Hsin-I; Tsikata, Edem; Doyle, John M. (American Physical Society, 2008)
      The \(v = 1 \to 0\) radiative lifetime of \(NH (X^3 \Sigma^-, v=1, N=0)\) is determined to be \(\tau_{rad,\text{exp.}} = 37.0 \pm 0.5_{\text{stat}}{}^{+2.0} _{-0.8\text{syst}}\) miliseconds, corresponding to a transition ...