Signal enhancement in 5QMAS spectra of spin-5/2 quadrupolar nuclei

Amir Goldbourt, Shimon Vega

Research output: Contribution to journalArticlepeer-review


5QMAS experiments on spin-5/2 systems display a low sensitivity compared with their 3QMAS counterparts. Nevertheless, the superior resolution of 5QMAS over 3QMAS makes these experiments a favorable choice for many materials. We report an enhancement scheme for the 5QMAS experiment, using an improved five-quantum excitation pulse scheme combined with a FAM-II conversion pulse. The results are verified experimentally on a polycrystalline sample of γ-27Al2O3, showing an enhancement factor of 2.4 over the simple two-pulse (CW) 5QMAS scheme. Numerical computations of the efficiency parameter ε support these results.

Original languageEnglish
Pages (from-to)280-286
Number of pages7
JournalJournal of Magnetic Resonance
Issue number2
StatePublished - 2002
Externally publishedYes


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