@article {3531, title = {Rotaxane probes for the detection of hydrogen peroxide by 129Xe hyperCEST NMR}, journal = {Angewandte Chemie International Edition}, year = {2019}, doi = {10.1002/anie.201903045}, url = {https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201903045}, author = {Klass, Sarah H and Truxal, Ashley E and Fiala, T A and Kelly, Joseph and Nguyen, Dang and Finbloom, Joel A and Wemmer, David E and Pines, Alexander and Francis, Matthew B} } @article {2699, title = {Invited Review Article: Instrumentation for nuclear magnetic resonance in zero and ultralow magnetic field}, journal = {Review of Scientific Instruments}, volume = {88}, year = {2017}, month = {09/2017}, abstract = {

We review experimental techniques in our laboratory for nuclear magnetic resonance (NMR) in zero and ultralow magnetic field (below 0.1 μT) where detection is based on a low-cost, non-cryogenic, spin-exchange relaxation free 87Rb atomic magnetometer. The typical sensitivity is 20-30 fT/Hz1/2 for signal frequencies below 1 kHz and NMR linewidths range from Hz all the way down to tens of mHz. These features enable precision measurements of chemically informative nuclear spin-spin couplings as well as nuclear spin precession in ultralow magnetic fields.

}, doi = {https://doi.org/10.1063/1.5003347}, url = {http://aip.scitation.org/doi/abs/10.1063/1.5003347}, author = {Tayler, MCD and Theis, Thomas and Tobias F. Sjolander and John W. Blanchard and Kentner, A and Pustelny, S and Pines, Alexander and Budker, Dmitry} } @article {1117, title = {Chemical analysis using J-coupling multiplets in zero-field NMR}, journal = {Chemical Physics Letters}, volume = {580}, year = {2013}, month = {08/2013}, pages = {160-165}, abstract = {

Zero-field nuclear magnetic resonance (NMR) spectroscopy is emerging as a new, potentially portable, and cost-effective NMR modality with the ability to provide information-rich, high-resolution spectra. We present simple rules for analysis of zero-field NMR spectra based on first-order perturbation theory and the addition of angular momenta. These rules allow for the prediction of observed spectral lines without numerical simulation. Results are presented for a few small organic molecules with characteristic spin topologies, demonstrating unambiguous assignment of peaks, highlighting the potential of zero-field NMR as a tool for chemical identification.

}, isbn = {0009-2614}, doi = {http://dx.doi.org/10.1016/j.cplett.2013.06.042}, url = {http://www.sciencedirect.com/science/article/pii/S0009261413008191}, author = {Theis, Thomas and Blanchard, John W. and Butler, Mark C. and Ledbetter, Micah P. and Budker, Dmitry and Pines, Alexander} } @article {1350, title = {Hyperpolarized xenon-based molecular sensors for label-free detection of analytes}, journal = {Journal of the American Chemical Society}, volume = {136}, year = {2013}, month = {12/2013}, pages = {164-168}, doi = {10.1021/ja406760r}, author = {Garimella, Praveena and Meldrum, Tyler and Witus, Leah Suzanne and Smith, Monica and Bajaj, Vikram and Wemmer, David E. and Francis, Matthew B. and Pines, Alexander} } @article {246, title = {Multiplets at zero magnetic field: The geometry of zero-field NMR}, journal = {The Journal of Chemical Physics}, volume = {138}, year = {2013}, month = {05/14/}, pages = {184202-15}, keywords = {Zeeman effect}, url = {http://dx.doi.org/10.1063/1.4803144}, author = {Butler, Mark C. and Ledbetter, Micah P. and Theis, Thomas and Blanchard, John W. and Budker, Dmitry and Pines, Alexander} } @article {1094, title = {Parahydrogen-induced polarization at zero magnetic field}, journal = {The Journal of Chemical Physics}, volume = {138}, year = {2013}, month = {06/2013}, pages = {234201}, abstract = {

We use symmetry arguments and simple model systems to describe the conversion of the singlet state of parahydrogen into an oscillating sample magnetization at zero magnetic field. During an initial period of free evolution governed by the scalar-coupling Hamiltonian HJ, the singlet state is converted into scalar spin order involving spins throughout the molecule. A short dc pulse along the z axis rotates the transverse spin components of nuclear species I and S through different angles, converting a portion of the scalar order into vector order. The development of vector order can be described analytically by means of single-transition operators, and it is found to be maximal when the transverse components of I are rotated by an angle of \±π/2 relative to those of S. A period of free evolution follows the pulse, during which the vector order evolves as a set of oscillating coherences. The imaginary parts of the coherences represent spin order that is not directly detectable, while the real parts can be identified with oscillations in the z component of the molecular spin dipole. The dipole oscillations are due to a periodic exchange between Iz and Sz, which have different gyromagnetic ratios. The frequency components of the resulting spectrum are imaginary, since the pulse cannot directly induce magnetization in the sample; it is only during the evolution under HJ that the vector order present at the end of the pulse evolves into detectable magnetization. \© 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4805062]

}, doi = {doi: http://dx.doi.org/10.1063/1.4805062}, url = {http://link.aip.org/link/?JCP/138/234201\&aemail=author}, author = {Butler, Mark C. and Kervern, Gwendal and Theis, Thomas and Ledbetter, Micah P. and Ganssle, Paul J. and Blanchard, John W. and Budker, Dmitry and Pines, Alexander} } @article {1318, title = {Suppression of electron spin decoherence of the diamond NV center by a transverse magnetic field}, journal = {Physical Review B}, volume = {88}, year = {2013}, month = {10/2013}, abstract = {

We demonstrate that the spin decoherence of nitrogen vacancy (NV) centers in diamond can be suppressed by a transverse magnetic field if the electron spin bath is the primary decoherence source. The NV spin coherence, created in \“a decoherence-free subspace,\” is protected by the transverse component of the zero-field splitting, increasing the spin-coherence time about twofold. The decoherence due to the electron spin bath is also suppressed at magnetic fields stronger than \∼25 G when applied parallel to the NV symmetry axis. Our method can be used to extend the spin-coherence time of similar spin systems for applications in quantum computing, field sensing, and other metrologies.

}, doi = {10.1103/PhysRevB.88.161412}, url = {http://prb.aps.org/abstract/PRB/v88/i16/e161412}, author = {Shin, Chang S. and Avalos, Claudia E. and Butler, Mark C. and Wang, Hai-Jing and Seltzer, Scott J. and Liu, Ren-Bao and Pines, Alexander and Bajaj, Vikram S.} } @article {262, title = {Compressed sensing of remotely detected MRI velocimetry in microfluidics}, journal = {Journal of Magnetic Resonance}, volume = {205}, year = {2010}, month = {8//}, pages = {196-201}, keywords = {Flow imaging}, isbn = {1090-7807}, doi = {http://dx.doi.org/10.1016/j.jmr.2010.04.016}, url = {http://www.sciencedirect.com/science/article/pii/S1090780710001187}, author = {Paulsen, Jeffrey and Bajaj, Vikram S. and Pines, Alexander} } @article {679, title = {Fourier transform multiple quantum nuclear magnetic resonance}, journal = {Faraday Symposia of the Chemical Society}, volume = {13}, year = {1978}, pages = {49-55}, abstract = {

The excitation and detection of multiple quantum transitions in systems of coupled spins offers, among other advantages, an increase in resolution over single quantum n.m.r. since the number of lines decreases as the order of the transition increases. This paper reviews the motivation for detecting multiple quantum transitions by a Fourier transform experiment and describes an experimental approach to high resolution multiple quantum spectra in dipolar systems along with results on some protonated liquid crystal systems. A simple operator formalism for the essential features of the time development is presented and some applications in progress are discussed.

}, isbn = {0301-5696}, url = {http://dx.doi.org/10.1039/FS9781300049}, author = {Drobny, Gary and Pines, Alexander and Sinton, Steven and Weitekamp, Daniel P. and Wemmer, David} }