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Dear all,

I am new to NMR and I have difficulty understanding the ordering of FIDs, e.g. if an experiment uses both Rance-Kay and States, there will be loops(outer/inner) which need to be taken care during data processing. I don't completely understand how FIDs(indirect dimension) are stored and in what order. In a pulse sequnece, what an inner or outer loop corresponds to? How does nmrpipe do sort such loops?

asked Mar 24 '13 at 13:05

nmr2rmn's gravatar image


updated Mar 26 '13 at 02:16

I assume that this is a 3D experiment? I beat my head against this while adding 3D procesing to SpinWorks. I also depends on thether the "phase" array is 1,2 or 2,1. - Kirk Marat (Mar 25 '13 at 07:36)

This was a 4D experiment. How do we understand the FID layers for, lets say, "phase" array 1,2? - nmr2rmn (Mar 25 '13 at 08:13)

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If standard pulse sequences are used, Varian files loop over indirect phases first, in the order specified by the "array" parameter. http://connjur.uchc.edu/docs/st/assumptions/ documents how the CONNJUR Spectrum Translator (ST) reads the files and ST is open source if anyone wants the code (Java.)


answered Mar 26 '13 at 04:20

Gerard's gravatar image


Thanks...that clears up a bit of confusion I had :) - nmr2rmn (Mar 27 '13 at 02:12)

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