Z-restored spin-echo 13C 1D spectrum of straight baseline free of hump, dip and roll

Youlin Xia, Sean Moran, Edward P. Nikonowicz, Xiaolian Gao

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

A pulse sequence of z-restored spin echo, -π-β-τ-π-τ-, employing a π pulse in the middle of the delay (2τ) to form a spin echo and the two π pulses together to restore the residual longitudinal magnetization back to +z direction, is described. 13C spectra of organic compounds provide a wealth of structural information; however, 13C 1D spectra acquired using reverse geometry probes can have significant baseline humps or rolls because of pulse ring-down within the coil. The baseline distortions are especially apparent in spectra acquired using cryogenically enhanced probes. The baseline problem may be alleviated by extending the delay between the last pulse and the starting point of acquisition. However, uses of long delay times introduce large negative first-order phase corrections which themselves produce baseline roll. The prescribed experiment can be used to completely remove the hump, roll or dip in the baseline of the 13C spectrum and at the same time obtain sensitivity similar to the experiment of a single β pulse. We believe that this experiment will be of general applications in acquiring high-quality 13C NMR data with reverse geometry probes and spectral interpretation.

Original languageEnglish (US)
Pages (from-to)432-435
Number of pages4
JournalMagnetic Resonance in Chemistry
Volume46
Issue number5
DOIs
StatePublished - May 1 2008

Keywords

  • Backward linear prediction
  • Baseline hump
  • Broadband inversion and refocusing
  • Carbon spectrum
  • Cold probe
  • Cryoprobe
  • NMR
  • Spin echo
  • z-Restored spin echo

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