DFS MQ-MAS references

Below are provided some NMR references about MQ-MAS with DFS sequence applied to half-integer quadrupole spins. These references contain
(1) the pulse-sequence diagram,
(2) the coherence-transfer pathways,
(3) the phase-cycling,
(4) the receiver-phase relationship.

1. J. Kanellopoulos, D. Freude, and A. Kentgens
   A practical comparison of MQMAS techniques,
   Solid State Nucl. Magn. Reson. 32, 99-108 (2008).
2. A. Goldbourt and P. K. Madhu
   Multiple-Quantum Magic Angle Spinning: High-resolution solid state NMR spectroscopy of half-integer quadrupolar nuclei, (1)(2)
   Monatsh. Chem. 133, 1497-1534 (2002).
3. H. Schäfer, D. Iuga, R. Verhagen, and A. P. M. Kentgens
   Population and coherence transfer in half-integer quadrupolar spin systems induced by simultaneous rapid passages of the satellite transitions: A static and spinning single crystal nuclear magnetic resonance study, (1)
   J. Chem. Phys. 114, 3073-3091 (2001).
4. A. Goldbourt, P. K. Madhu, S. Kababya, and S. Vega
   The influence of the radiofrequency excitation and conversion pulses on the lineshapes and intensities of the triple-quantum MAS NMR spectra of I = 3/2 nuclei, (1)
   Solid State Nucl. Magn. Reson. 18, 1-16 (2000).
5. D. Iuga, H. Schäfer, R. Verhagen, and A. P. M. Kentgens
   Population and coherence transfer induced by double frequency sweeps in half-integer quadrupolar spin systems,
   J. Magn. Reson. 147, 192-209 (2000).
6. A. P. M. Kentgens and R. Verhagen
   Advantages of double frequency sweeps in static, MAS and MQMAS NMR of spin I = 3/2 nuclei, (1)
   Chem. Phys. Lett. 300, 435-443 (1999).

Related bibliography

1. A. Brinkmann and A. P. M. Kentgens
   Sensitivity enhancement and heteronuclear distance measurements in biological ¹⁷O solid-state NMR,
   J. Phys. Chem. B 110, 16089-16101 (2006).
2. I. Hung and R. W. Schurko
   Solid-state ⁹¹Zr NMR of bis(cyclopentadienyl)dichloro zirconium(IV),
   J. Phys. Chem. B 108, 9060-9069 (2004).
3. R. W. Schurko, I. Hung, and C. M. Widdifield
   Signal enhancement in NMR spectra of half-integer quadrupolar nuclei via DFS-QCPMG and RAPT-QCPMG pulse sequences, (1)
   Chem. Phys. Lett. 379, 1-10 (2003).
4. D. Iuga and A. P. M. Kentgens
   Triple-quantum excitation enhancement in MQMAS experiments on spin I = 5/2 systems,
   Chem. Phys. Lett. 343, 556-562 (2001).
5. M. Nijman, M. Ernst, A. P. M. Kentgens, and B. H. Meier
   Rotational-resonance NMR experiments in half-integer quadrupolar spin systems,
   Mol. Phys. 98, 161-178 (2000).
6. E. Van Veenendaal, B. H. Meier, and A. P. M. Kentgens
   Frequency stepped adiabatic passage excitation of half-integer quadrupolar spin systems,
   Mol. Phys. 93, 195-213 (1998).
7. J. Haase and M. S. Conradi
   Sensitivity enhancement for NMR of the central transition of quadrupolar nuclei,
   Chem. Phys. Lett. 209, 287-291 (1993).
8. A. P. M. Kentgens
   Quantitative excitation of half-integer quadrupolar nuclei by a frequency-stepped adiabatic half-passage,
   J. Magn. Reson. 95, 619-625 (1991).