000080304 001__ 80304
000080304 005__ 20181203020239.0
000080304 0247_ $$2doi$$a10.1016/0009-2614(92)87002-7
000080304 037__ $$aARTICLE
000080304 245__ $$aPreparing initial conditions for rotational resonance in solid state NMR spectroscopy
000080304 269__ $$a1992
000080304 260__ $$c1992
000080304 336__ $$aJournal Articles
000080304 520__ $$aThe internuclear distance between two homonuclear dipolar-coupled dil. spins-1/2, SA and SX, can be measured by rotational resonance expts. in solid state NMR. These involve rotating the sample at the magic angle while fulfilling the condition for rotational resonance, WA-WX= nwr, where WA and WX are the isotropic shifts. Interpretation of the results is simplest if the spin system is prepd. in a state of pure difference polarization, described by an initial d. operator V(t = 0) = D = SAz-SXz, regardless of the orientation of the crystallites. Prepn. of such a state is a nontrivial task if the chem. shift anisotropy w0DVA,X of one (or both) of the sites is comparable to the difference in isotropic shifts WA-WX and hence to the required spinning speed wr = (WA-WX)/n. It is shown how the difference polarization state D can be prepd. by combining total sideband suppression (TOSS) sequences with their time-reversed counterparts, or by more condensed sequences of rotor-synchronized p pulses. [on SciFinder (R)]
000080304 700__ $$aGeen, Helen
000080304 700__ $$aLevitt, Malcolm H.
000080304 700__ $$0243177$$aBodenhausen, Geoffrey$$g122795
000080304 773__ $$j200$$k4$$q350-6$$tChemical Physics Letters
000080304 909C0 $$0252152$$pLRMB$$xU10098
000080304 909CO $$ooai:infoscience.tind.io:80304$$pSB$$particle
000080304 937__ $$aLRMB-ARTICLE-1992-007
000080304 970__ $$a147/LRMB
000080304 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000080304 980__ $$aARTICLE