@article {485,
	title = {Sidebands in dynamic angle spinning (DAS) and double rotation (DOR) NMR},
	journal = {Solid State Nuclear Magnetic Resonance},
	volume = {1},
	year = {1992},
	note = {Solid State Nucl MagV26htTimes Cited:63Cited References Count:29},
	month = {Dec},
	pages = {267-295},
	abstract = {<p>A theory of dynamic angle spinning (DAS) and double rotation (DOR) NMR is described using average Hamiltonian and irreducible tensor methods. Sideband intensities in DAS and DOR spectra are analyzed by both the moment and Bessel function methods, and general formulae are derived. Results show that the DAS moments depend on the relative rotor phase between the first and the second evolution periods, whereas the second and third DOR moments are independent of the relative phase between the inner and outer rotors. Sideband intensities in DAS spectra also depend on the relative rotor phases between evolution at the first and second angles, as well as on the ratio of time spent at each angle. Sideband intensities and phases in DOR spectra are related to the relative rotor phases between the inner and outer rotors, and the sideband pattern is determined by the ratio of the inner and outer rotor spinning speeds. An inversion symmetry of the odd numbered DOR sidebands at the relative rotor phase gamma(r) = 0 degrees. 180 degrees permits the elimination of these sidebands. Finally, numerical simulations are implemented and shown to agree with experimental results. Quadrupolar parameters can therefore be recovered either by calculating the second and third moments or by simulating the sideband intensities and phases.</p>
},
	keywords = {central transition},
	isbn = {0926-2040},
	doi = {Doi 10.1016/0926-2040(92)90047-D},
	url = {<Go to ISI>://WOS:000208537400006},
	author = {Sun, B. Q. and Baltisberger, J. H. and Wu, Y. and Samoson, A. and Pines, A.}
}
@article {508,
	title = {Study of the Aluminophosphates Alpo4-21 and Alpo4-25 by Al-27 Double-Rotation Nmr},
	journal = {Journal of the American Chemical Society},
	volume = {113},
	year = {1991},
	note = {J Am Chem SocFn005Times Cited:53Cited References Count:16},
	month = {May 22},
	pages = {4097-4101},
	abstract = {<p>Aluminum-27 double-rotation NMR in a magnetic field of 11.7 T distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor ALPO4(-21). Upon calcination, ALPO4(-21) transforms to ALPO4(-25), which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7 T field. The two tetrahedral environments, however, have a different quadrupole coupling constants and are distinguished by double rotation at 4.2 T field. The quadrupole coupling constants obtained for these sites indicates that the tetrahedral aluminum environments are less distorted in the hydrated material.</p>
},
	keywords = {nuclei},
	isbn = {0002-7863},
	doi = {Doi 10.1021/Ja00011a007},
	url = {<Go to ISI>://WOS:A1991FN00500007},
	author = {Jelinek, R. and Chmelka, B. F. and Wu, Y. and Grandinetti, P. J. and Pines, A. and Barrie, P. J. and Klinowski, J.}
}
