Now showing items 1-10 of 10

    • Dependence of nuclear spin singlet lifetimes on RF spin-locking power 

      Devience, Stephen J; Walsworth, Ronald L.; Rosen, Matthew Scot (Elsevier BV, 2012)
      We measure the lifetime of long-lived nuclear spin singlet states as a function of the strength of the RF spin-locking field and present a simple theoretical model that agrees well with our measurements, including the ...
    • Low-Cost High-Performance MRI 

      Sarracanie, Mathieu; LaPierre, Cristen D.; Salameh, Najat; Waddington, David E. J.; Witzel, Thomas; Rosen, Matthew S. (Nature Publishing Group, 2015)
      Magnetic Resonance Imaging (MRI) is unparalleled in its ability to visualize anatomical structure and function non-invasively with high spatial and temporal resolution. Yet to overcome the low sensitivity inherent in ...
    • Multidimensional Mapping of Spin-Exchange Optical Pumping in Clinical-Scale Batch-Mode 129Xe Hyperpolarizers 

      Nikolaou, Panayiotis; Coffey, Aaron M.; Ranta, Kaili; Walkup, Laura L.; Gust, Brogan M.; Barlow, Michael J.; Rosen, Matthew S.; Goodson, Boyd M.; Chekmenev, Eduard Y. (American Chemical Society, 2014)
      We present a systematic, multiparameter study of Rb/129Xe spin-exchange optical pumping (SEOP) in the regimes of high xenon pressure and photon flux using a 3D-printed, clinical-scale stopped-flow hyperpolarizer. In situ ...
    • Nuclear spin singlet states as a contrast mechanism for NMR spectroscopy 

      Devience, Stephen J; Walsworth, Ronald Lee; Rosen, Matthew Scot (Wiley-Blackwell, 2013)
      Nuclear magnetic resonance (NMR) spectra of complex chemical mixtures often contain unresolved or hidden spectral components, especially when strong background signals overlap weaker peaks. In this article we demonstrate ...
    • Paramagnetic Ion-Doped Nanocrystal as a Voltage-Controlled Spin Filter 

      Efros, Al. L.; Rashba, Emmanuel; Rosen, Matthew Scot (American Physical Society (APS), 2001)
      A theory of spin injection from a ferromagnetic source into a semiconductor through a paramagnetic ion-doped nanocrystal is developed. Spin-polarized current from the source polarizes the ion; the polarized ion, in turn, ...
    • Preparation of Nuclear Spin Singlet States Using Spin-Lock Induced Crossing 

      Devience, Stephen J; Walsworth, Ronald Lee; Rosen, Matthew Scot (American Physical Society (APS), 2013)
      We introduce a broadly applicable technique to create nuclear spin singlet states in organic molecules and other many-atom systems. We employ a novel pulse sequence to produce a spin-lock induced crossing (SLIC) of the ...
    • Probing scalar coupling differences via long-lived singlet states 

      Devience, Stephen; Walsworth, Ronald Lee; Rosen, Matthew Scot (Elsevier BV, 2016)
      We probe small scalar coupling differences via the coherent interactions between two nuclear spin singlet states in organic molecules. We show that the spin-lock induced crossing (SLIC) technique enables the coherent ...
    • Silicon Nanoparticles as Hyperpolarized Magnetic Resonance Imaging Agents 

      Aptekar, Jacob W.; Cassidy, Maja Clare; Johnson, Alexander C.; Barton, Robert A.; Lee, Menyoung; Ogier, Alexander C.; Vo, Chinh; Anahtar, Melis Nuray; Yin, Ren; Bhatia, Sangeeta; Ramanathan, Chandrasekhar; Cory, David G.; Hill, Alison Lynn; Mair, Ross W.; Rosen, Matthew Scot; Walsworth, Ronald L.; Marcus, Charles Masamed (American Chemical Society, 2009)
      Magnetic resonance imaging of hyperpolarized nuclei provides high image contrast with little or no background signal. To date, in vivo applications of prehyperpolarized materials have been limited by relatively short nuclear ...
    • Temperature-Ramped 129Xe Spin-Exchange Optical Pumping 

      Nikolaou, Panayiotis; Coffey, Aaron M.; Barlow, Michael J.; Rosen, Matthew S.; Goodson, Boyd M.; Chekmenev, Eduard Y. (American Chemical Society, 2014)
      We describe temperature-ramped spin-exchange optical pumping (TR-SEOP) in an automated high-throughput batch-mode 129Xe hyperpolarizer utilizing three key temperature regimes: (i) “hot”—where the 129Xe hyperpolarization ...