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

✍ Scribed by A. Kaikkonen; E.E. Ylinen; M. Punkkinen

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 403 KB
• Volume: 10
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/s0926-2040(97)00082-9

✦ Synopsis

Optimal conditions were calculated for the excitation and detection of the five quantum coherence of quadrupolar nuclei Ž . Ž . with I s 5r2 in powder samples, observed by the two-pulse sequence u y t y u y t , where a is the phase

cycling angle. We varied the pulse lengths and the relative values of the nutation frequency v s g B and the quadrupolar 1 1 frequency v . Also, the effect of the resonance offset was studied under optimal conditions. Besides, the conditions for Q obtaining the maximal echo amplitude after the two-pulse sequence with a s y were found. Theoretical results were compared with experiments on 27 Al nuclei in polycrystalline AlCl .