Gradshimau
 

Gradshimau

I have a problem with gradshim (gradshimau) in topspin. The problem is that im getting spitting on solvent peak (and all other peaks as well) due to poor Z-Shimming.

I have tried 2 ways of creating new shimmaps:

1 I used 3%CHCl3 in Aceton d6 (but I'm not sure this is the best sample to use due to the long relaxation time of the sample). Anyways, i created a new GSHIM file and new shimmapping. When runing Gradshimau Users experienced that they need to manualy shim (especially) Z2 due to the splitting of the peaks.

2 The same procedure as above but with a sample that contained 90% D20 / 10% H20 + CuSO4, im attaching the shimmap that i created from this sample. the problem is stil that we end up with unwanted splitting due to poor Z2 shiming.

http://img87.imageshack.us/img87/4499/smqnp20101027.jpg

Any sugestions on how to continue?



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