TY - JOUR
T1 - Signal enhancement in 5QMAS spectra of spin-5/2 quadrupolar nuclei
AU - Goldbourt, Amir
AU - Vega, Shimon
N1 - Funding Information:
The authors thank P. K. Madhu for fruitful discussions. This research was supported by the Israel–US Binational Science Foundation.
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0036299419&partnerID=8YFLogxK
U2 - 10.1006/jmre.2001.2475
DO - 10.1006/jmre.2001.2475
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AN - SCOPUS:0036299419
SN - 1090-7807
VL - 154
SP - 280
EP - 286
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
IS - 2
ER -