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- 2D NMR spectroscopy referred to both frequency axes.
- It is actually a 3D plot.
- It requires two Fourier transformations at right angle to each other – two independent time axes to arrive at two orthogonal frequency axes.
- In this, multiple pulse sequence are considered:-
- Equilibrated period is followed by two pulses with an intervening time interval.
- Final pulse being the π / 2 acquisition pulse.
- Evolution period between the pulses.
- Sequential FT transformation of these FIDS yields a set of spectra which peak intensities varies sinusodally.
- If evolution time interval over many different experiments is varied and collected the resulting FIDS into one overall experiment.
- The first series of FTS – results – second frequency axis – derived from acquisition time of FID.
- The second series are FTS results in the first frequency axis – function of evolution of time.