Conditional Bounds on Polarization Transfer Export

@article{citeulike:4501709, abstract = {The implications of constraints on unitary transformations of spin operators with respect to the accessible regions of Liouville space are analyzed. Specifically, the effects of spin-permutation symmetry on the unitary propagators are investigated. The influence of 2 and 3 propagator symmetry on two-dimensional bounds for F z = Σ N i =1 I iz ↔ G z = Σ M j =1 S jz polarization transfer in IS and I 2 S spin- systems is examined in detail. One result is that the maximum achievable F z ↔ G z polarization transfer is not reduced by permutation symmetry among the spins. For I 2 S spin systems, 3 symmetry in the unitary propagator is shown to significantly reduce the accessible region in the 2D F z -S z Liouville subspace compared to the case restricted by unitarity alone. That result is compared with transformations under symmetric dipolar and scalar J coupling as well as shift and RF interactions. An important practical implication is that the refined spin thermodynamic theory of Levitt, Suter, and Ernst ( J. Chem. Phys. 84 , 4243, 1986) for cross polarization in solid-state NMR does not predict experimental outcomes incompatible with constraints of unitarity and spin-permutation symmetry.}, author = {Nielsen, N. and Soerensen, O. W.}, citeulike-article-id = {4501709}, citeulike-linkout-0 = {http://dx.doi.org/10.1006/jmra.1995.1101}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S1064-1858(85)71101-1}, doi = {10.1006/jmra.1995.1101}, issn = {10641858}, journal = {Journal of Magnetic Resonance, Series A}, keywords = {methyl, nmr-theory, spin-dynamics}, month = {May}, number = {1}, pages = {24--31}, posted-at = {2009-05-11 01:54:51}, priority = {2}, title = {Conditional Bounds on Polarization Transfer}, url = {http://dx.doi.org/10.1006/jmra.1995.1101}, volume = {114}, year = {1995} }

TY - JOUR ID - citeulike:4501709 L3 - citeulike-article-id:4501709 N2 - The implications of constraints on unitary transformations of spin operators with respect to the accessible regions of Liouville space are analyzed. Specifically, the effects of spin-permutation symmetry on the unitary propagators are investigated. The influence of 2 and 3 propagator symmetry on two-dimensional bounds for F z = Σ N i =1 I iz ↔ G z = Σ M j =1 S jz polarization transfer in IS and I 2 S spin- systems is examined in detail. One result is that the maximum achievable F z ↔ G z polarization transfer is not reduced by permutation symmetry among the spins. For I 2 S spin systems, 3 symmetry in the unitary propagator is shown to significantly reduce the accessible region in the 2D F z -S z Liouville subspace compared to the case restricted by unitarity alone. That result is compared with transformations under symmetric dipolar and scalar J coupling as well as shift and RF interactions. An important practical implication is that the refined spin thermodynamic theory of Levitt, Suter, and Ernst ( J. Chem. Phys. 84 , 4243, 1986) for cross polarization in solid-state NMR does not predict experimental outcomes incompatible with constraints of unitarity and spin-permutation symmetry. IS - 1 JF - Journal of Magnetic Resonance, Series A SN - 10641858 EP - 31 TI - Conditional Bounds on Polarization Transfer VL - 114 SP - 24 KW - methyl KW - nmr-theory KW - spin-dynamics AU - Nielsen, N AU - Soerensen, OW PY - 1995/05// UR - http://dx.doi.org/10.1006/jmra.1995.1101 ER -