Rigid isotropic rotor

An alternative explanation, consistent with the data, is that dipole-dipole relaxation dominates for /1-carotene, but that molecular reorientation is anisotropic and occurs in a time range where the NOE is less than the maximum of 2.99 that is found in the extreme naiTOwing region. For a rigid isotropic rotor, the con-elation times are such that I and Tj will be independent of magnetic field strength and the NOE will... 

Rigid, isotropic rotor. If we suppose that the rotor makes random jumps to new, random orientations then its orientational autocorrelation function will decay in the same first-order way as radioactive fission of nuclei. Therefore, in this case... 

What are the electric-dipole selection rules for a two-particle rigid rotor exposed to isotropic radiation ... 

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