%0 Journal Article %J J. Phys. Chem. C %D 2017 %T Understanding the magnetic resonance spectrum of nitrogen vacancy centers in an ensemble of randomly-oriented nanodiamonds %A Jeong, K %A Parker, AJ %A Page, RH %A Pines, A %A Vassiliou, C %A King, JP %B J. Phys. Chem. C %G eng %0 Journal Article %J Angewandte Chemie %D 2014 %T Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer (Cover Article) %A Ganssle, P. J. %A Shin, H. D. %A Seltzer, S. J. %A Bajaj, V.S. %A Ledbetter, M. P. %A Budker, D. %A Knappe, S. %A Kitching, J. %A Pines, A %B Angewandte Chemie %V 53 %P 1-6 %8 09/2014 %G eng %N 37 %R DOI: 10.1002/anie.201403416 %0 Journal Article %J Chemical Physics Letters %D 2011 %T Ultrafast optical encoding of magnetic resonance %A Trease, D. %A Bajaj, V. S. %A Paulsen, J. %A Pines, A. %K state %X

Temporal resolution in magnetic resonance imaging (MRI) is limited by the time required to encode the position of spins using time-varying (10-100 ms) magnetic field gradients. Here, we demonstrate spatial encoding of MRI images in a time that is three orders of magnitude shorter than what is possible by conventional gradient encoding techniques. Our method exploits the chemically induced dynamic nuclear polarization (CIDNP) effect and is an initial example of a set of approaches that seek to combine the favorable properties of optical spectroscopy with those of NMR for polarization, encoding, and detection. (C) 2010 Elsevier B.V. All rights reserved.

%B Chemical Physics Letters %V 503 %P 187-190 %8 Feb 17 %@ 0009-2614 %G English %U ://WOS:000287187800001 %N 4-6 %M WOS:000287187800001 %! Ultrafast optical encoding of magnetic resonance %R Doi 10.1016/J.Cplett.2010.12.063 %0 Journal Article %J Journal of the American Chemical Society %D 2003 %T Using switched angle spinning to simplify NMR spectra of strongly oriented samples %A Havlin, R. H. %A Park, G. H. J. %A Mazur, T. %A Pines, A. %K solids %X

This contribution describes a method that manipulates the alignment director of a liquid crystalline sample to obtain anisotropic magnetic interaction parameters, such as dipolar coupling, in an oriented liquid crystalline sample. By changing the axis of rotation with respect to the applied magnetic field in a spinning liquid crystalline sample, the dipolar couplings present in a normally complex strong coupling spectrum are scaled to a simple weak coupling spectrum. This simplified weak coupling spectrum is then correlated with the isotropic chemical shift in a switched angle spinning (SAS) two-dimensional (2D) experiment. This dipolar-isotropic 2D correlation was also observed for the case where the couplings are scaled to a degree where the spectrum approaches strong coupling. The SAS 2D correlation of C6F5Cl in the nematic liquid crystal I52 was obtained by first evolving at an angle close to the magic angle (54.7degrees) and then directly detecting at the magic angle. The SAS method provides a 2D correlation where the weak coupling pairs are revealed as cross-peaks in the indirect dimension separated by the isotropic chemical shifts in the direct dimension. Additionally, by using a more complex SAS method which involves three changes of the spinning axis, the solidlike spinning sideband patterns were correlated with the isotropic chemical shifts in a 2D experiment. These techniques are expected to enhance the interpretation and assignment of an isotropic. magnetic interactions including dipolar couplings for molecules dissolved in oriented liquid crystalline phases.

%B Journal of the American Chemical Society %V 125 %P 7998-8006 %8 Jul 2 %@ 0002-7863 %G English %U ://WOS:000183814500059 %N 26 %M WOS:000183814500059 %! Using switched angle spinning to simplify NMR spectra of strongly oriented samples %R Doi 10.1021/Ja0342244