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A more specific example of this case is presented in the section Chemical Exchange Magnetization transfer. In either case, magnetization transfer techniques probe the dynamic relationship between two or more distinguishable nuclei populations, in so far as energy exchange between the populations can be induced and measured in an idealized NMR ...
This process is sometimes referred to as "spin-locking". The power of one contact pulse is typically ramped to achieve a more broadband and efficient magnetization transfer. The evolution of the X NMR signal intensity during the cross polarization is a build-up and decay process whose time axis is usually referred to as the "contact time".
Especially for molecules exhibiting slowly relaxing (T 1) signals, the technique spin saturation transfer (SST) provides information on chemical exchange reactions. The method is widely applicable to fluxional molecules. This magnetization transfer technique provides rates, provided that they exceed 1/T 1. [4]
The magnetization transfer process takes place through multiple, efficient one-bond magnetization transfer steps, rather than a single step through the smaller and variable 3 J HH couplings. The relatively large size and good uniformity of the one-bond couplings allowed the design of efficient magnetization transfer schemes that are effectively ...
Insensitive nuclei enhancement by polarization transfer (INEPT) is a signal enhancement method used in NMR spectroscopy. It involves the transfer of nuclear spin polarization from spins with large Boltzmann population differences to nuclear spins of interest with lower Boltzmann population differences. [ 1 ]
Magnetization is then transferred from the proton to the heteronucleus through a one-bond scalar coupling (J-coupling), ensuring that only directly bonded nuclei participate in the transfer. Subsequently, the system evolves during a period called t 1 , and the magnetization is transferred back from the heteronuclear to the proton.
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A quantitative measure of the excess is the magnetization, which is the average value of the spin: M = 1 N ∑ i = 1 N σ i . {\displaystyle M={\frac {1}{N}}\sum _{i=1}^{N}\sigma _{i}.} A bogus argument analogous to the argument in the last section now establishes that the magnetization in the Ising model is always zero.