First-Data-Point problem and the baseline distortion in Fourier-transformNMR spectroscopy with simultaneous sampling

0205517 - UPT-D 20020067 RIV US eng J - Journal Article
Starčuk jr., Zenon - Bartušek, Karel - Starčuk, Zenon
First-Data-Point problem and the baseline distortion in Fourier-transformNMR spectroscopy with simultaneous sampling.
Journal of Magnetic Resonance. A. Roč. 108, - (1994), s. 177 - 188. ISSN 1064-1858
Institutional research plan: CEZ:AV0Z2065902
Keywords : baseline distortion * NMR
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering
Impact factor: 1.555, year: 1994

The baseline distortions often arising in spectra after linear phase correction have often been attributed to an improper value of the first acquired data point of the free-induction decay. However, correction of this value by multiplying it by a certain factor depending on the timing of the excitation sequence has not proved to be reliable unless some very specific conditions are met. In this article, the origin of these distortions is thoroughly examined in both the frequency and the time domain. It is shown that the problem can be explained generally as an improper resampling of the original signal as a result of the linear phase correction. A way of avoiding these artifacts is proposed. However, it is shown that generally theproper correction must affect the whole signal in a complex way and that suitable timing of the experiment is highly desirable.
Permanent Link: http://hdl.handle.net/11104/0101130