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Related Experiment Video

Updated: Apr 17, 2026

Hyperpolarized Xenon for NMR and MRI Applications
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Hyperpolarized Xenon for NMR and MRI Applications

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Systematic T1 improvement for hyperpolarized 129xenon.

Maricel Repetto1, Earl Babcock2, Peter Blümler1

  • 1Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, 55128 Mainz, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 24, 2015
PubMed
Summary
This summary is machine-generated.

Hyperpolarized (HP) Xenon-129 spin-lattice relaxation time (T1) was significantly improved using GE180 glass cells. Carbon dioxide addition further enhanced T1 by influencing Xe-Xe interactions.

Keywords:
(129)XeBreak-up rateBuffer gasesDestruction rateIsotopeLaser polarizationLongitudinalRelaxationSpin–latticeVan der WaalsWall

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Optics
  • Materials Science

Background:

  • Hyperpolarized (HP) Xenon-129 (¹²⁹Xe) is crucial for advanced NMR imaging.
  • Optimizing spin-lattice relaxation time (T1) is essential for enhancing signal-to-noise ratio in HP ¹²⁹Xe applications.
  • Understanding relaxation mechanisms in HP ¹²⁹Xe is key to improving its utility.

Purpose of the Study:

  • To improve the spin-lattice relaxation time (T1) of hyperpolarized (HP) Xenon-129 (¹²⁹Xe).
  • To investigate wall relaxation times in GE180 glass cells under typical storage conditions.
  • To study the effect of buffer gases on Xe-Xe nuclear spin-relaxation rates.

Main Methods:

  • Measurements of T1 for HP ¹²⁹Xe in uncoated, spherical GE180 glass cells (∅=10 cm).
  • Investigation of wall relaxation (T(1)(wall)) and Xe-Xe relaxation (T(1)(Xe-Xe)) rates.
  • Addition of buffer gases (N₂, SF₆, CO₂) to study their effect on Xe-Xe dimer relaxation.

Main Results:

  • Observed very long wall relaxation times (T(1)(wall) ≈ 18 h) in GE180 glass cells.
  • Identified and mitigated an "aging" effect in wall relaxation through cleaning procedures.
  • Determined Xe-Xe relaxation rate (T(1)(Xe-Xe) = (4.6±0.1) h) for 85% isotopically enriched ¹²⁹Xe.
  • CO₂ demonstrated high efficiency in shortening Xe-Xe dimer lifetime, further enhancing T1.
  • Observed a shorter T(1)(Xe-Xe) for ¹²⁹Xe in natural abundance compared to 85% enriched gas.

Conclusions:

  • GE180 glass cells provide excellent conditions for long T1 relaxation times in HP ¹²⁹Xe.
  • Buffer gases, particularly CO₂, can be used to tune Xe-Xe interactions and optimize T1.
  • Isotopic enrichment significantly impacts Xe-Xe relaxation dynamics, highlighting the importance of gas composition.