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. Author manuscript; available in PMC: 2013 May 22.
Published in final edited form as: Phys Rev B Condens Matter Mater Phys. 2012 Dec 14;8672(21):e214410. doi: 10.1103/PhysRevB.86.214410

FIG. 6.

FIG. 6

(Color online) Intensity of the magic echo observed in adamantane for different values of τ and ω1 corresponding to the RF field applied during the π/2 pulses of the magic sandwich. As described in the text, the RF amplitude during the spin-locking pulses (periods C and D in Fig. 1) was kept constant for all experiments. The values of τ are 100 µs (▪/black), 200 µs (⋆/red), 250 µs (▴/blue), and 350 µs (▾/green) corresponding to τDeff = 4.7, 9.4, 12, and 17 respectively. The variation in the echo amplitude with ω1 and τ is due largely to the second and higher order terms of the Magnus expansion.