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. Author manuscript; available in PMC: 2006 May 1.
Published in final edited form as: Chem Phys Lett. 2005 Jun 7;408(1-3):118–122. doi: 10.1016/j.cplett.2005.04.017

Fig. 1.

Fig. 1.

RF pulse sequences for the spin exchange at magic angle (SEMA) via the heteronuclear (I and S) dipolar coupling. (A) SEMA, (B) SEMA-MAS, (C) TANSEMA and (D) TANSEMA-MAS pulse sequences. (E) Variation of the scaling factor of the PITANSEMA-MAS as a function of τc/τLG for a time averaged factor, (τ1 - τ2)/τc, of 1/3; τc is a cycle time of TANSEMA-MAS and τLG is the 2π duration of the LG sequence. An rf field strength of 62.5 kHz for FFLG and an NH dipolar coupling of 10 kHz were used in the simulation. BTAN is the effective nutation field, νr is the spinning speed, and LG stands for Lee-Goldburg.