Browsing by Author "Sadeghpour, Hossein"

Now showing items 1-10 of 10

    • Anisotropic Hyperfine Interactions Limit the Efficiency of Spin-Exchange Optical Pumping of 3He Nuclei 

      Tscherbul, T. V.; Zhang, Peng; Sadeghpour, Hossein R.; Dalgarno, Alexander (American Physical Society (APS), 2011)
      We use accurate ab initio and quantum scattering calculations to demonstrate that the maximum He3 spin polarization that can be achieved in spin-exchange collisions with potassium (K39) and silver (Ag107) atoms is limited ...

    • 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 ...

    • Collision-Induced Spin Exchange of Alkali-Metal Atoms With \(^3\)He: An Ab Initio Study 

      Tscherbul, T.V.; Zhang, P.; Sadeghpour, Hossein R.; Dalgarno, Alexander (American Physical Society, 2009)
      We present a rigorous quantum study of spin-exchange transitions in collisions of the alkali-metal atoms with \(^3\)He in the presence of an external magnetic field. Using accurate ab initio interaction potentials, we ...

    • Collision-induced spin exchange of alkali-metal atoms withH3e: Anab initiostudy 

      Tscherbul, T. V.; Zhang, Peng; Sadeghpour, Hossein R.; Dalgarno, Alexander (American Physical Society (APS), 2009)
      We present a rigorous quantum study of spin-exchange transitions in collisions of the alkali-metal atoms with H3e in the presence of an external magnetic field. Using accurate ab initio interaction potentials, we obtain ...

    • Collisions of Trapped Molecules With Slow Beams 

      Tscherbul, Timur V.; Pavlovic, Zoran; Sadeghpour, Hossein R.; Côté, Robin; Dalgarno, Alexander (American Physical Society, 2010)
      We present a theoretical study of molecular-trap loss induced by collisions with slow atomic beams based on an explicit analysis of collision kinematics in the laboratory frame and a rigorous quantum description of ...

    • Formation of van der Waals Molecules in Buffer-Gas-Cooled Magnetic Traps 

      Brahms, Nathan; Tscherbul, Timur; Zhang, Peng; Klos, Jacek; Sadeghpour, Hossein R.; Dalgarno, Alexander; Doyle, John M.; Walker, Thad G. (American Physical Society, 2010)
      We predict that a large class of helium-containing cold polar molecules form readily in a cryogenic buffer gas, achieving densities as high as 10\(^{12}\)  cm\(^{-3}\). We explore the spin relaxation of these molecules in ...

    • A Homonuclear Molecule with a Permanent Electric Dipole Moment 

      Li, W.; Pohl, T.; Rost, J. M.; Rittenhouse, Seth T.; Sadeghpour, Hossein R.; Nipper, J.; Butscher, B.; Balewski, J. B.; Bendkowsky, V.; Löw, R.; Pfau, T. (American Association for the Advancement of Science (AAAS), 2011)
      Permanent electric dipole moments in molecules require a breaking of parity symmetry. Conventionally, this symmetry breaking relies on the presence of heteronuclear constituents. We report the observation of a permanent ...

    • Potential energy curves for the interaction of Ag(5s) and Ag(5p) with noble gas atoms 

      Loreau, J.; Sadeghpour, Hossein R.; Dalgarno, Alexander (AIP Publishing, 2013)
      We investigate the interaction of ground and excited states of a silver atom with noble gases (NG), including helium. Born-Oppenheimer potential energy curves are calculated with quantum chemistry methods and spin-orbit ...

    • Resonant H – Photodetachment: Enhanced Photodestruction and Consequences for Radiative Feedback 

      Miyake, S.; Stancil, P. C.; Sadeghpour, Hossein R.; Dalgarno, Alexander; McLaughlin, B. M.; Forrey, R. C. (IOP Publishing, 2010)
      The hydrogen negative ion plays a crucial role in the formation of hydrogen molecules in the early universe. Cooling through excitation of \(H_2\) drives the formation of the first cosmological objects. The \(H_2\) molecules ...

    • Structure and Spectroscopy of Ground and Excited States of LiYb 

      Zhang, Peng; Sadeghpour, Hossein R.; Dalgarno, Alexander (American Institute of Physics, 2010)
      Multireference configuration interaction and coupled cluster calculations have been carried out to determine the potential energy curves for the ground and low-lying excited states of the LiYb molecule. The scalar relativistic ...