A Correlation Between NMR Peak Intensities and a Fictitious Spin 1/2 Presentation of the z-Component of Nuclear Spins I > 1/2

作者：Eliav Uzi^*

来源：Concepts in Magnetic Resonance: Part A , 2013, 42(5): 182-186.

DOI：10.1002/cmr.a.21283

• fictitious spin 1
• 2
• quadrupolar nuclei
• peak intensities of spins I > 1
• 2

In a recent publication, it was suggested that for I>1/2 the peaks intensities can be interpreted to be the result of spin dynamics along the z axis. The intensity ratios were found to be independent of the magnetic field, suggesting that the important factor determining the peak intensities is the operator I-z, and its interaction with the radio frequency magnetic field. In the current comment, we suggest that a presentation of this operator as a superposition of fictitious spins 1/2 provides an alternative explanation for the correlation between the I-z operator and the peak intensities. It is further shown that the correlation between the I-z operator and the NMR peak intensities is valid only for nonselective excitation or under conditions where Fermi's golden rule applies. The relevance of the spin-lock experiment for such a correlation is discussed.

• 出版日期2013-9