Author Topic: Quadrupolar echoes for spin-7/2  (Read 1851 times)

MalcolmHLevitt

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Quadrupolar echoes for spin-7/2
« on: September 19, 2014, 06:12:33 PM »
The attached notebook shows how to calculate the spectrum of a spin-7/2 nucleus (for example 133Cs) in an oriented medium, such as a gel (see for example P. W. Kuchel, "Quadrupolar Splitting in Stretched Hydrogels," in "eMagRes," Ed. (John Wiley & Sons, Ltd, 2007)). The EnsembleAverage function is used to generated a spread in quadrupolar interactions, corresponding to gel inhomogeneity. A simulation shows that a two-pulse sequence generates a series of quadrupolar echoes with curious fractional timings, as predicted in a very old paper by Solomon (I. Solomon, "Multiple Echoes in Solids," Phys. Rev. 110, 61 (1958)).




Philip Kuchel

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Re: Quadrupolar echoes for spin-7/2
« Reply #1 on: May 07, 2015, 08:19:57 PM »
A superb illustration of the versatility of SpinDynamica to account for real experimental data from stretched hydrogels.
Philip