Elucidation of Dipolar Coupling Networks under Magic-Angle Spinning

✍ Scribed by Helen Geen; Johannes Gottwald; Robert Graf; Ingo Schnell; Hans W. Spiess; Jeremy J. Titman

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 83 KB
• Volume: 125
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1104

✦ Synopsis

A variety of novel two-dimensional shift correlation ex-initial ''preparation'' period involves the excitation of the coherence, which is sampled during the subsequent ''evoluperiments have been proposed recently (1) which allow contion'' period. In the ''mixing'' period, the coherences which nectivities between dipolar-coupled spins in solids to be eluevolve in the first dimension are converted into transverse cidated with the high-resolution characteristic of magicmagnetization for acquisition during the final ''detection'' angle-spinning spectra (MAS). In order to reconcile the period. During appropriate periods of each experiment, a conflicting requirements of MAS and magnetization transfer recoupling sequence is applied which generates a doublethrough dipole-dipole couplings, these experiments incorquantum dipolar average Hamiltonian of the type porate recoupling sequences during a mixing period inserted between the evolution and detection times. The recoupling sequences reintroduce either a zero-or a double-quantum 224