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Insensitive Nuclei Enhanced by Polarization TransferInsensitive Nuclei Enhanced by Polarization Transfer (INEPT) is a signal enhancement method used in NMR spectroscopy which involves the transfer of nuclear spin polarization from spins with large Boltzmann population differences to nuclear spins of interest with low Boltzmann population differences. INEPT uses J-coupling for the polarization transfer in contrast to the Nuclear Overhauser Effect which arises from dipolar cross-relaxation. Additional recommended knowledgeThe signal enhancement has two sources:
As a result, INEPT can enhance the NMR signal by a factor larger than K, while the NOE can increase the signal by a factor of at most 1+K/2[citation needed]. Note that a negative value of K may result in a reduction in signal intensity; historically INEPT was proposed a method to enhance the signal from the limited number of nuclei with negative magnetogyric ratio e.g. 15N or 29Si. |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Insensitive_Nuclei_Enhanced_by_Polarization_Transfer". A list of authors is available in Wikipedia. |