Highly resolved double absorption 2D NMR spectra from complex severely truncated 2D phase-modulated signals by filter-diagonalization-averaging method

Application of the filter diagonalization method (FDM) to the spectral esti mation of purely phase-modulated 2D-J NMR data is described. It is shown th at obtaining an entire 2D line list of spectral parameters is not a prerequ isite for constructing a spectral estimate of the data. Common problems wit h 2D FT analysis, such as phase-twist Lineshapes, spectral broadening from the time-frequency uncertainty principle, and vanishing phase-sensitive 45 degrees projections, can be ameliorated using 2D FDM. Averaging over severa l different FDM calculations improves the spectral presentation. Examples a re shown with complex spectra obtained using only a handful of time increme nts. (C) 1999 Elsevier Science B.V. All rights reserved.