@article { ISI:000226728000011,
	title = {Increasing the sensitivity of 2D high-resolution NMR methods applied to quadrupolar nuclei},
	journal = {Journal of Magnetic Resonance},
	volume = {172},
	number = {2},
	year = {2005},
	month = {FEB},
	pages = {268-278},
	publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE},
	type = {Article},
	address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA},
	abstract = {<p>Gan and Kwak recently proposed a soft-pulse added mixing (SPAM) idea in the classical two-pulse multiple-quantum magic-angle spinning scheme. In the SPAM method, a soft pi/2 pulse is added after the second hard-pulse (conversion pulse) and all coherence orders in between them are constructively used to obtain the signal. We, here, further extend this idea to distributed samples where the signal mainly results from echo pathways and that from anti-echo pathways dies Out after a few t(1) increments. We show that, with a combination of SPAM and collection of fewer anti-echoes, an enhancement of the signal to noise ratio by a factor of ca. 3 may be obtained over the z-filtered version. This may prove to be useful even for samples with long T{\textquoteright}(2) relaxation times. (C) 2004 Elsevier Inc. All rights reserved.</p>},
	keywords = {high-resolution, quadrupolar nuclei, sensitivity, Solid-state NMR},
	issn = {1090-7807},
	doi = {10.1016/j.jmr.2004.11.001},
	author = {Amoureux, J. P. and Delevoye, L. and Steuernagel, S. and Gan, Zhengting and Ganapathy, Subramanian and Montagne, L.}
}
@article { ISI:000259337100008,
	title = {Heteronuclear dipolar decoupling effects on multiple-quantum and satellite-transition magic-angle spinning NMR spectra},
	journal = {Magnetic Resonance in Chemistry},
	volume = {46},
	number = {10},
	year = {2008},
	month = {OCT},
	pages = {948-954},
	publisher = {JOHN WILEY \& SONS LTD},
	type = {Article},
	address = {THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND},
	abstract = {<p>We here report on the influence of heteronuclear dipolar decoupling on the Al-27 3QMAS, 5QMAS, and the double-quantum filter-satellite-transition magic-angle spinning (DQF-STMAS) spectra of a strongly dipolar-coupled system, gibbsite. The requirements for heteronuclear dipolar decoupling increase with the order of coherence evolving in the indirect dimension of a two-dimensional (2D) experiment. The isotropic line width of the high-resolution 2D spectra, in samples like gibbsite, is composed of four parts: the distribution of isotropic shifts (delta(ISO), delta(QIS)), the homogeneous broadening related to the proton-proton flip-flop terms, the Al-27-Al-27 homonulcear dipolar couplings, and the H-1-Al-27 heteronuclear dipolar couplings. It is shown that, even in the case of gibbsite, where a strong proton-proton bath exists, the main resolution limiting factor in these experiments resides in the H-1-Al-27 dipolar interaction. Copyright (C) 2008 John Wiley \&amp; Sons, Ltd.</p>},
	keywords = {heteronuclear broadening, heteronuclear decoupling, homogeneous broadening, MQMAS, quadrupolar nuclei, Solid-state NMR, STMAS, TPPM},
	issn = {0749-1581},
	doi = {10.1002/mrc.2286},
	author = {Ganapathy, Subramanian and Delevoye, L. and Arnoureux, J. P. and Madhu, Perunthiruthy K.}
}
