NMR@CEMHTI

Two Dimensional One Pulse (TOP) processing...

D.Massiot, J.Hiet, N.Pellerin, F.Fayon, M.Deschamps, S.Steuernagel, P.J.Grandinetti 'Two dimensional One Pulse MAS of Half-Integer Quadrupolar Nuclei' Journal of Magnetic Resonance 181 310-315 (2006) view publication details and/or ask for a reprint Example files : got to the download page (right side) or click on the following link 27Al Yag Example for TOP processing save this file to your disk and load it into 'dmfit' [Menu|Decomposition|Load Other]or drag the file to an open 'dmfit' session only works starting from #dm20090318

TOP reconstruction protocol (only available from dm2006 versions)

1. Download the TOP example files [Download] and extract the zip file to a directory of you choice.

2. Load the "YAG 300 001 BL.1R" 1D file [Menu/File/Open. The 1D files shows multiple spinning sidebands arising from the satellite transitions of AlO₆ and AlO₄ contributions.
   

3. Load the default decomposition parameters [Menu/Decomposition/Load Fit]. This decomposition file only contains a fit of the <+/-3/2> spinning sidebands allowing an exact measurement of the spinning rate (31244.29Hz).

4. Generate the 2D TOP spectrum by calling [Menu/Tools/TOP/1D->2D]
   Click the "baseline correct" to add a baseline correction after the 1D->2D conversion
   Click the "separate slices" to separate the reconstructed spinning sideband slices by nulls
   Click the "to 2D" button to execute or "Quit" to exit
   

5. You should now have a 2D spectrum looking like this (after rescaling with [Menu/Graph/Parameters change "level div" to 1.9].
   In this spectrum you see
       + the AlO₆ sharp line with its satellite transition (right most intense line)
       + the AlO₄ second order broadened central transition, only showing up in the central slice (N=0) with its <+-3/2> transition on the left side (sharp ridge) and even some contributions of the <+-5/2> transitions.
   

6. Build the sum spectrum (equivalent to synchronized acquisition) by calling [Menu/Tools/TOP/Proj all] and obtain the spectrum below showing clearly the <1/2>, <3/2> and <5/2> transitions (from right to left) of the AlO₄ contribution
   

7. Go to the left panel button and select "ssb" from the projection list ("no proj" by default) and build the projection again [Menu/Tools/TOP/Proj N#0] and obtain the spectra of the satellite transitions alone (by ignoring the N=0 central transition).