Elimination of dispersion-components from high resolution NMR spectra and transverse relaxation times measurement

NMR spectra obtained by Fourier transform of J-modulated spin echo signals show usually a complex lineshape due to phase modulation. To obtain pure absorption signal, the spin echo signal is commonly reshaped using an apodization function in the time domain. Then the calculation performed in the absolute mode leads to loss of resolution. A practical data processing is proposed to suppress unwanted dispersion using time domain signals of spin echo experiments with different echo times. Pure absorption mode spectra may be obtained without altering the resolution. The method is applied to provide pure absorption proton spectra of D-glucose and D-proline and also to get measurements of proton spin-spin relaxation times in the spectrum of D-proline.