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A temperature-controlled sample shuttle for field-cycling NMR.

Andrew M R Hall1, Topaz A A Cartlidge1, Giuseppe Pileio1

  • 1University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 11, 2020
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Summary
This summary is machine-generated.

A novel temperature-controlled sample shuttle enables precise Nuclear Magnetic Resonance (NMR) measurements. This device achieved record-long lifetimes for molecules supporting long-lived states at low magnetic fields and elevated temperatures.

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Field-cycling NMRSample shuttleSinglet NMRSpin relaxation

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Area of Science:

  • Chemistry
  • Physics
  • Materials Science

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for molecular analysis.
  • Precise temperature control is crucial for accurate NMR measurements, especially at variable magnetic field strengths.
  • Long-lived quantum states in molecules offer potential for advanced NMR applications.

Purpose of the Study:

  • To design and implement a temperature-controlled sample shuttle for NMR.
  • To investigate the effect of variable magnetic field strength on relaxation time constants.
  • To achieve new record lifetimes for molecules supporting long-lived states.

Main Methods:

  • A temperature-controlled sample shuttle was developed using a water-ethylene glycol heat transfer fluid.
  • Temperature gradients across the sample were minimized to <0.05 °C, reducing convection.
  • Longitudinal (T1) and singlet order (TS) relaxation time constants were measured for two molecules.

Main Results:

  • The sample shuttle provided accurate and stable temperature control during NMR measurements.
  • New record lifetimes for long-lived states were observed at low magnetic field strengths.
  • Measurements were successfully conducted at temperatures above ambient.

Conclusions:

  • The developed sample shuttle is effective for high-precision NMR experiments.
  • The findings demonstrate the potential for enhanced NMR sensitivity using long-lived states.
  • This work facilitates further exploration of molecular dynamics and quantum phenomena in NMR.