Relaxation times as a function of temperature in NMR

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SUMMARY

NMR relaxation times T1 and T2 exhibit a clear dependence on sample temperature, with T1 decreasing at lower temperatures and increasing at higher temperatures. T1, the spin-lattice relaxation time, is influenced by magnetic field variations and energy dissipation into the bulk material, while T2, the spin-spin relaxation time, results from interactions between neighboring spin systems. The relationship between relaxation times and temperature is complex and warrants further exploration in specialized literature, such as Slichter's texts.

PREREQUISITES
  • Understanding of NMR (Nuclear Magnetic Resonance) principles
  • Familiarity with spin-lattice and spin-spin relaxation concepts
  • Knowledge of temperature effects on material properties
  • Basic grasp of magnetic field interactions in NMR
NEXT STEPS
  • Read Slichter's book on NMR for in-depth explanations of relaxation times
  • Investigate the impact of temperature on molecular dynamics in NMR
  • Explore advanced NMR techniques for measuring T1 and T2
  • Study the effects of different materials on relaxation times in NMR experiments
USEFUL FOR

Researchers, physicists, and chemists involved in NMR studies, particularly those interested in the effects of temperature on relaxation times and material properties.

neorich
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Good Morning, I have been carrying out some NMR relaxation measurements (T1 and T2), and have found that they have a dependence on the temperature of the sample, for example T1 is small at lower temperatures, and larger at higher temperatures.

Can anyone explain why there is a dependence of these relaxation times on the sample temperature, in other words what is it about the sample properties at different temperatures that changes the values of T1 & T2?

Any help is much appreciated.

Thanks for your help.

neorich2002
 
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T1, the spin-lattice relaxation time, describes dephasing due to magnetic field variations, and energy loss into the bulk material. T2, the spin-spin relaxation time, arises from coupling between neighboring spin systems. Both are temperature dependent, but in general the dependencies can be complex. Sorry I can't help with specifics. Books like Slichter's should describe this is more detail.
 

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