Zeeman magnetization

In [49, 76], the line intensities for electric quadrupole and Zeeman (magnetic dipole) splitting and including the anisotropy of the /-factor are also given for / = 2 <-> 7g = 0 transitions (even-even isotopes, e.g., in the rare earth region or in W, Os). 

The rotational resonance (R ) determination of the distance between members of a homonuclear spin pair is based on rotation-enhanced transfer of Zeeman magnetization. This transfer occurs when the MAS frequency is adjusted to satisfy the R condition 8 = tKo, where 6 is the isotropic chemical shift difference between the two resonances of the spin pair [110], n is a small integer, and is the spinning speed. For carbon-carbon distances, appropriate samples may be engineered by selective pairwise C labeling. 

Fig. 13. The overcorrection error generated in a Zeeman magnetic field when phosphate is present at the 326-nm line of Cd.

The technique to shift molecular transitions into coincidence with fixed frequencies of a laser is called laser magnetic resonance (LMR). This type of spectroscopy, which is used for studying unstable molecules, was combined with the double resonance technique by Lowe and McKellar. A radiofrequency double resonance cell was placed in the 6-cm gap of the electromagnet of an intracavity laser magnetic resonance apparatus. The Zeeman magnetic field was oriented parallel to the laser light polarization (AM = 0 infrared transitions) and perpendicular to the electric field vector... 

When the RR condition is satisfied, a rapid exchange of Zeeman magnetization occurs in addition to dipolar broadening. We will not present a complete theoretical description of the origins of this exchange, but rather present some of the important approximate results of such a treatment. It is convenient to define... 

A pictorial representation of rotational resonance and the exchange of Zeeman magnetization... 

This can be done by carrying out lineshape simulations. However, in general this is not done because a Zeeman magnetization exchange experiment is more... 

Figure 7 Zeeman magnetization exchange plot for the peptide P3A-A2 fragments shown in Figure 6. The open circles are experimentally determined data points the solid lines result from simulations assuming a trans geometry the dotted lines result from simulations assuming a cis geometry. Reproduced with permission of the American Chemical Society from Costa PR, Kocisko DA, Sun BQ, Lansbury PT Jr and Griffin RG (1997) Journai of the American Chemical Society 119 10487-10493.

Expand the Breit-Rabi formula up to terms of order x and thus obtain a precise expression for the frequency of the Zeeman magnetic resonance transitions AF=0,... 

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