@article {307,
	title = {NMR in rotating magnetic fields: magic-angle field spinning},
	journal = {Magnetic Resonance Imaging},
	volume = {23},
	year = {2005},
	note = {Magn Reson ImagingSp. Iss. SI920ADTimes Cited:10Cited References Count:16},
	month = {Feb},
	pages = {295-299},
	abstract = {<p>Magic-angle sample spinning is one of the cornerstones in high-resolution NMR of solid and semisolid materials. The technique enhances spectral resolution by averaging away rank 2 anisotropic spin interactions, thereby producing isotropic-like spectra with resolved chemical shifts and scalar couplings. In principle, it should be possible to induce similar effects in a static sample if the direction of the magnetic field is varied (e.g., magic-angle rotation of the B-0 field). Here we will review some recent experimental results that show progress toward this goal. Also, we will explore some alternative approaches that may enable the recovery of spectral resolution in cases where the field is rotating off the magic angle. Such a possibility could help mitigate the technical problems that render difficult the practical implementation of this method at moderately strong magnetic fields. (c) 2005 Elsevier Inc. All rights reserved.</p>
},
	keywords = {samples},
	isbn = {0730-725X},
	doi = {Doi 10.1016/J.Mri.2004.11.067},
	url = {<Go to ISI>://WOS:000228658400030},
	author = {Sakellariou, D. and Meriles, C. A. and Martin, R. W. and Pines, A.}
}
@article {306,
	title = {NMR spectroscopy in inhomogeneous B-0 and B-1 fields with non-linear correlation},
	journal = {Journal of Magnetic Resonance},
	volume = {175},
	year = {2005},
	note = {J Magn Reson939CPTimes Cited:8Cited References Count:38},
	month = {Jul},
	pages = {1-10},
	abstract = {<p>Resolved NMR spectra from samples in inhomogeneous B-0 and B-1 fields can be obtained with the so-called \&quot;ex situ\&quot; methodology, employing a train of composite or adiabatic z-rotation RF pulses to periodically refocus the inhomogeneous broadening during the detection of the time-domain signal. Earlier schemes relied on a linear correlation between the inhomogeneous B0 and B, fields. Here the pulse length, bandwidth, and amplitude of the adiabatic pulses of the hyperbolic secant type are adjusted to improve the refocusing for a setup with non-linear correlation. The field correlation is measured using a two-dimensional nutation experiment augmented with a third dimension with varying RF carrier frequency accounting for off-resonance effects. The pulse optimization is performed with a computer algorithm using the experimentally determined field correlation and a standard adiabatic z-rotation pulse as a starting point for the iterative optimization procedure. The shape of the z-rotation RF pulse is manipulated to provide refocusing for the conditions given by the sample-, magnet-, and RF-coil geometry. (c) 2005 Elsevier Inc. All rights reserved.</p>
},
	keywords = {spectra},
	isbn = {1090-7807},
	doi = {Doi 10.1016/J.Jmr.2005.03.006},
	url = {<Go to ISI>://WOS:000230050200001},
	author = {Topgaard, D. and Sakellariou, D. and Pines, A.}
}
