Couplings split rigid

Flanged rigid couplings, split rigid or clamp couplings... 

To complete the expansion of the general matrix Schrodinger equation (7) in powers of k, we need to analyze the nonadiabatic coupling Aj as well. Inspection of Eq. (9) shows that these couplings split into a term arising from the quasi-rigid motion, and a term corresponding to... 

Figure 7.7 Fast but anisotropic segmental motion results in a solid-like contribution to the NMR signal. This contribution is expressed in terms of a fractional contribution q of the second moment M2 of the rigid lattice line of a single chain or residual dipolar interactions between protons. The line splitting caused by the dipole-dipole interaction depends on the orientation angle q of the internuclear vector of the coupling protons in the magnetic field B(). The distribution of orientation angles changes with the...

In rigid aromatic and aliphatic compounds, the quadrupole splitting of (Fig. 3.1.1 (a)) is of the order of 130 kHz. The interaction is quadratic with respect to the spin vector I. It is described by the quadrupole coupling tensor Q, which is proportional to the tensor of the electric field gradient. The average of Q is determined by its trace Spur (in German). Following the Laplace equation, the trace is zero,... 

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