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Signal enhancement in NMR spectra of half-integer quadrupolar nuclei via DFS–QCPMG and RAPT–QCPMG pulse sequences

✍ Scribed by Robert W Schurko; Ivan Hung; Cory M Widdifield

Book ID
104108557
Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
302 KB
Volume
379
Category
Article
ISSN
0009-2614

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✦ Synopsis

Two signal enhancement schemes capable of providing large signal-to-noise gains in static and magic-angle spinning NMR spectra of the central transition of half-integer quadrupolar nuclei are presented. Amplitude-modulated doublefrequency sweeps (AM-DFS) and rotor-assisted population transfer (RAPT) pulse sequences are used as preparatory sequences in combination with the quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) pulse sequence to obtain large signal enhancements ranging from one to two orders of magnitude. Specific applications to two spin-3/2 nuclei ( 87 Rb and 39 K) and one spin-5/2 nucleus ( 85 Rb) are presented.

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Sensitivity enhancement of NMR spectra of half-integer quadrupolar nuclei in the solid state via population transfer
✍ Renée Siegel; Thomas T. Nakashima; Roderick E. Wasylishen 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 251 KB

Three population transfer techniques for improving the sensitivity of the central transition of NMR spectra from half-integer quadrupolar nuclei in the solid state are described. Two of the methods attempt to invert the populations of energy levels associated with the satellite transitions either by