Unexpected Echo intensity increase in DOSY
 

Unexpected Echo intensity increase in DOSY

Hi,

I ran a typical dosy expt and got an unexpected increase onecho intensity in the begining of the array.The first 3 points have increasing intensity, then it goesdown more or less as guaussian.

Did anybody here ever see that?It would make sense if i start with a present gradienton the opposite direction, but i didnt.

pulse sequence=stebpgp1s, bruker bipol. grad. with spoil grad.Gradients are arrayed from 2% to 60%.Liquid sample on DMSO, Molec. Weight ca. 6000, T=25C.

Regards!



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