@article {270,
	title = {Shimmed matching pulses: Simultaneous control of rf and static gradients for inhomogeneity correction},
	journal = {Journal of Chemical Physics},
	volume = {131},
	year = {2009},
	note = {J Chem Phys536HUTimes Cited:4Cited References Count:30},
	month = {Dec 21},
	abstract = {<p>Portable NMR systems generally suffer from poor field homogeneity and are therefore used more commonly for imaging and relaxation measurements rather than for spectroscopy. In recent years, various approaches have been proposed to increase the sample volume that is usable for spectroscopy. These include approaches based on manual shimming and those based on clever combinations of modulated radio frequency and gradient fields. However, this volume remains small and, therefore, of limited utility. We present improved pulses designed to correct for inhomogeneous dispersion across wide ranges of frequency offsets without eliminating chemical shift or spatial encoding. This method, based on the adiabatic double passage, combines the relatively larger corrections available from spatially matched rf gradients [C. Meriles , J. Magn. Reson. 164, 177 (2003)]. with the adjustable corrections available from time-modulated static field gradients [D. Topgaard , Proc. Natl. Acad. Sci. U.S.A. 101, 17576 (2004)]. We explain the origins of these corrections with a theoretical model that simplifies and expedites the design of the pulse waveforms. We also present a generalized method for evaluating and comparing pulses designed for inhomogeneity correction. Experiments validate this method and support simulations that offer new possibilities for significantly enhanced performance in portable environments.</p>
},
	keywords = {design},
	isbn = {0021-9606},
	doi = {Doi 10.1063/1.3243850},
	url = {<Go to ISI>://WOS:000273036300030},
	author = {Franck, J. M. and Demas, V. and Martin, R. W. and Bouchard, L. S. and Pines, A.}
}
@article {291,
	title = {Spin coherence transfer in chemical transformations monitored by remote detection NMR},
	journal = {Analytical Chemistry},
	volume = {79},
	year = {2007},
	note = {Anal Chem151QATimes Cited:7Cited References Count:39},
	month = {Apr 1},
	pages = {2806-2811},
	abstract = {<p>We demonstrate a nuclear magnetic resonance (NMR) experiment using continuous flow in a microfluidic channel for studying the transfer of spin coherence in nonequilibrium chemical processes. We use the principle of remote detection, which involves spatially separated NMR encoding and detection coils. As an example, we provide the map of chemical shift correlations for the amino acid alanine as it transitions from the zwitterionic to the anionic form. The presented method uniquely allows for tracking the migration of encoded spins during the course of any chemical transformation and can provide useful information about reaction mechanisms.</p>
},
	keywords = {lab},
	isbn = {0003-2700},
	doi = {Doi 10.1021/Ac062327+},
	url = {<Go to ISI>://WOS:000245304300022},
	author = {Anwar, M. S. and Hilty, C. and Chu, C. and Bouchard, L. S. and Pierce, K. L. and Pines, A.}
}
