Fast destruction of singlet order in NMR experiments

Bogdan A. Rodin, Kirill F. Sheberstov, Alexey S. Kiryutin, Lynda J. Brown, Richard C.D. Brown, Mohamed Sabba, Malcolm H. Levitt, Alexandra V. Yurkovskaya, Konstantin L. Ivanov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Some nuclear spin systems support long-lived states, which display greatly extended relaxation times relative to the relaxation time of nuclear spin magnetization. In spin-1/2 pairs, such a long-lived state is given by singlet order, representing the difference of the population of the nuclear singlet state and the mean population of the three triplets. In many cases, the experiments with long-lived singlet order are very time-consuming because of the need to wait for singlet order decay before the experiment can be repeated; otherwise, spin order remaining from a previous measurement may lead to experimental artifacts. Here, we propose techniques for fast and efficient singlet order destruction. These methods exploit coherent singlet-triplet conversion; in some cases, multiple conversion steps are introduced. We demonstrate that singlet order destruction enables a dramatic reduction of the waiting time between consecutive experiments and suggest to use this approach in singlet-state Nuclear Magnetic Resonance (NMR) experiments with nearly equivalent spins.

Original languageEnglish
Article number234203
Number of pages8
JournalJournal of Chemical Physics
Volume151
Issue number23
DOIs
Publication statusPublished - 21 Dec 2019

Keywords

  • LONG-LIVED STATES
  • NUCLEAR-SPIN STATES
  • DIFFUSION-COEFFICIENTS
  • SLOW DIFFUSION
  • POLARIZATION
  • SPECTROSCOPY
  • MOLECULES
  • CONTRAST
  • HYDROGEN
  • FIELD

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