Multiple-quantum and two-dimensional gas phase NMR

Seth Blackwell, Gerard S. Harbison

Research output: Contribution to journalArticle

Abstract

We introduce experiments designed to measure double- and zero-quantum frequencies and relaxation in the gas phase. We use a combination of phase cycling and gradients to achieve multiple quantum selectivity, and we note that conventional gradient strategies will not work because of the high diffusion constants of low-molecular-weight gases. We therefore choose the lengths of the gradients so that unwanted coherences fall at nodes in the integrated magnetization. We propose a related sequence that allows measurement of relaxation of either double- or zero-quantum coherence. Finally, we show T 2 relaxation curves for the 1H and 13C single-quantum relaxation, as well as the zero- and double-quantum relaxation, in 13C1-acetylene at natural abundance.

Original languageEnglish (US)
Pages (from-to)381-386
Number of pages6
JournaleMagRes
Volume6
Issue number3
DOIs
StatePublished - 2017

Keywords

  • Acetylene
  • Diffusion
  • Gas-phase NMR
  • Gradients
  • SR coupling
  • Spin relaxation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging
  • Spectroscopy

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