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Relaxation times as a function of temperature in NMR

  1. Feb 12, 2008 #1
    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
     
  2. jcsd
  3. Feb 15, 2008 #2

    marcusl

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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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