NMR Blog

NMR Blog

This page is the clearinghouse for all of the various blog posts about Nuclear Magnetic Resonance Spectroscopy from our work at Berea College.

The total echo experiment (which refocuses both J-coupling and Chemical Shift interactions at the same time) allows the user to collect the zero time echo point which otherwise is impossible in a normal Hahn Echo/CPMG/PIETA experiment. When the user wishes to collect a whole echo with each refocus period, you need the TE-PIETA approach (or a comparable total echo approach). The four-dimensional data is reduced by removing the 2 phase dimensions down to a two-dimensional dataset. An example of this reduced data is given in the following PDF file. Once the 2D FT is applied, we arrive at a dataset that correlates the isotropic chemical shift in the horizontal dimension with the J-coupling in the vertical dimension of this PDF. Slices through the two types of sites (Q0 and Q1) are shown in this PDF.

Density operator treatment of TE-PIETA
TE-PIETA pulse sequence and coherence pathways