Five quantum coherence of I=5/2 nuclei: Al-27 in polycrystalline AlCl3

: Kaikkonen A, Ylinen EE, Punkkinen M

Publisher: ELSEVIER SCIENCE BV

: 1998

Solid State Nuclear Magnetic Resonance

SOLID STATE NUCLEAR MAGNETIC RESONANCE

: SOLID STATE NUCL MAG

: 10

: 3

: 129

: 135

: 7

: 0926-2040

DOI: https://doi.org/10.1016/S0926-2040(97)00082-9

Optimal conditions were calculated for the excitation and detection of the five quantum coherence of quadrupolar nuclei with 1 = 5/2 in powder samples, observed by the two-pulse sequence (theta(1))(x) - tau(1) - (theta(2))(alpha) -tau(2), where alpha is the phase cycling angle. We varied the pulse lengths and the relative values of the nutation frequency omega(1) = gamma B-1 and the quadrupolar frequency omega(Q). Also, the effect of the resonance offset was studied under optimal conditions. Besides, the conditions for obtaining the maximal echo amplitude after the two-pulse sequence with alpha=y were found. Theoretical results were compared with experiments on Al-27 nuclei in polycrystalline AlCl3. (C) 1998 Elsevier Science B.V.

Physical sciences