Double quantum transition as the origin of the central dip in the z-spectrum of HDO in variably stretched gel

Uzi Eliav, Christoph Naumann, Gil Navon, Philip W. Kuchel

Research output: Contribution to journalArticlepeer-review

Abstract

The 2H NMR spectrum of HDO in gelatin gel, that is stretched inside silicone rubber tubing, displays a well resolved doublet. Spectra were obtained with a range of offset frequencies of partially saturating radio-frequency (RF) radiation. The resulting steady-state irradiation envelope (also referred to as a 'z-spectrum') has the peculiar feature that maximal suppression of the doublet occurs when the irradiation is applied exactly at the centre frequency, between the two HDO peaks. We present a quantum mechanical explanation for this phenomenon. It is shown that the phenomenon is the result of double quantum transitions. The analysis is extendable to more complex quadrupolar and dipolar-coupled systems of other nuclides. It has implications for enhancement of contrast in magnetic resonance imaging of heterogeneous systems using dipolar and quadrupolar interactions.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalJournal of Magnetic Resonance
Volume198
Issue number2
DOIs
StatePublished - Jun 2009

Keywords

  • Anisotropy
  • DO
  • Density matrix
  • Double quantum transition
  • H NMR
  • High-rank tensor relaxation
  • Liouville-von-Neumann equation
  • Residual quadrupolar coupling
  • Stretched gelatin

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