## Abstract Composite pulses that compensate for resonance offset and electric field gradient inhomogeneity are proposed for broadband excitation of pure nuclear quadrupole resonance systems in powders. The excitation band width of the composite pulse sequences was obtained with a numerical calcula
Composite pulse sequences for pure NQR in powders
โ Scribed by Geng-Ying Li; Xue-Wen Wu
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 302 KB
- Volume
- 204
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Composite pulses that compensate resonance offset and radi*frequency field inhomogeneity are proposed for broadband excitation of pure nuclear quadrupole resonance spin systems in powders. The excitation properties of the composite pulse se.quences are studied with the aid of numerical calculation, compared with a conventional single pulse and confirmed by "Cl experimental spectra of powdered NaClOs.
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This work presents a numerical approach to optimizing sequences with composite pulses for the pure NQR of a spin I = 32 powder sample. The calculations are based on a formalism developed in a previous paper, which allows a fast powder-averaging procedure to be implemented. The framework of the Cayle
Composite pulses designed to compensate the inhomogeneity of the radio-frequency field using numerical calculation procedures in spin-l NQR in powders are presented. It is demonstrated by computer simulation and experimental result that the perforrnanceofthe proposed composite pulses, ( ),( 1gO)90 a