@article {457, title = {Theory and Exact-Solutions for Tyckos Zero-Field Nmr in High-Field}, journal = {Journal of Magnetic Resonance Series A}, volume = {109}, year = {1994}, note = {J Magn Reson Ser APb546Times Cited:5Cited References Count:27}, month = {Aug}, pages = {157-165}, abstract = {

A theory of zero-field NMR in high field (ZFHF-NMR) is described in terms of coherent averaging and irreducible tensors. The theory is used to determine analytical solutions for the parameters of the trajectory proposed and used by Tycko. A new pulse sequence is presented, and optimized solutions for dynamic-angle spinning, dynamic-angle hopping, and double-rotation versions of ZFHF-NMR are discussed. (C) 1994 Academic Press, Inc.

}, keywords = {solid-state nmr}, isbn = {1064-1858}, doi = {Doi 10.1006/Jmra.1994.1149}, url = {://WOS:A1994PB54600003}, author = {Sun, B. Q. and Pines, A.} } @article {472, title = {An Approximate Method of Side-Band Intensity Calculation in Magic-Angle-Spinning Nmr}, journal = {Applied Magnetic Resonance}, volume = {5}, year = {1993}, note = {Appl Magn ResonLv192Times Cited:2Cited References Count:19}, pages = {43-61}, abstract = {

A theory of sideband intensity is derived by expanding into a Taylor series the free induction decay observed under magic angle spinning (MAS). According to this procedure, the free induction decay signal is completely represented by a basis of irreducible tensors from rank zero to rank infinity. After averaging over all orientations, only the zero-order irreducible tensors contribute to the sideband intensities. Symmetry properties of the sidebands can be seen clearly in this expansion, and an approximate formula up to ninth order is obtained by truncating the series. Sideband intensities can be calculated rapidly with this formula. The results agree satisfactorily with the exact sideband intensities obtained by numerical simulation if the ratio of the anisotropy to the spinning speed, omega0delta/omega(r), is smaller than 3. The relationship of the sideband intensities with the moments of a MAS spectrum shows that the proposed method is an alternative to moment analysis when the spinning speed is not very slow. Anisotropic information about the chemical shift anisotropy interaction therefore can be extracted efficiently from experimental spectra by this approximate method.

}, keywords = {nuclei}, isbn = {0937-9347}, url = {://WOS:A1993LV19200006}, author = {Sun, B. Q. and Pines, A.} } @article {470, title = {Effects of Double Rotation on Homonuclear Spin Systems}, journal = {Journal of Magnetic Resonance Series A}, volume = {102}, year = {1993}, note = {J Magn Reson Ser AKz354Times Cited:3Cited References Count:13}, month = {Mar}, pages = {29-33}, keywords = {solids}, isbn = {1064-1858}, doi = {Doi 10.1006/Jmra.1993.1064}, url = {://WOS:A1993KZ35400005}, author = {Wu, Y. and Peng, Z. Y. and Olejniczak, Z. and Sun, B. Q. and Pines, A.} } @article {477, title = {Side-Band Patterns in Dynamic-Angle-Spinning Nmr}, journal = {Journal of Magnetic Resonance Series A}, volume = {102}, year = {1993}, note = {J Magn Reson Ser AKz480Times Cited:19Cited References Count:26}, month = {Apr}, pages = {195-204}, keywords = {samples}, isbn = {1064-1858}, doi = {Doi 10.1006/Jmra.1993.1091}, url = {://WOS:A1993KZ48000011}, author = {Grandinetti, P. J. and Lee, Y. K. and Baltisberger, J. H. and Sun, B. Q. and Pines, A.} } @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 = {

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.

}, keywords = {central transition}, isbn = {0926-2040}, doi = {Doi 10.1016/0926-2040(92)90047-D}, url = {://WOS:000208537400006}, author = {Sun, B. Q. and Baltisberger, J. H. and Wu, Y. and Samoson, A. and Pines, A.} } @article {521, title = {Dynamic-Angle Spinning of Quadrupolar Nuclei}, journal = {Journal of Magnetic Resonance}, volume = {86}, year = {1990}, note = {J Magn ResonCu525Times Cited:288Cited References Count:32}, month = {Feb 15}, pages = {470-487}, isbn = {0022-2364}, doi = {Doi 10.1016/0022-2364(90)90025-5}, url = {://WOS:A1990CU52500003}, author = {Mueller, K. T. and Sun, B. Q. and Chingas, G. C. and Zwanziger, J. W. and Terao, T. and Pines, A.} } @article {514, title = {Nmr Experiments with a New Double Rotor}, journal = {Journal of Magnetic Resonance}, volume = {89}, year = {1990}, note = {J Magn ResonDu813Times Cited:113Cited References Count:13}, month = {Sep}, pages = {297-309}, isbn = {0022-2364}, doi = {Doi 10.1016/0022-2364(90)90236-3}, url = {://WOS:A1990DU81300008}, author = {Wu, Y. and Sun, B. Q. and Pines, A. and Samoson, A. and Lippmaa, E.} }