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On the Taylor expansion of the expression for the transition probability for normal absorption processes
Authors:E Nørby Svendsen
Institution:Department of Physical Chemistry , H.C. ?rsted Institute, University of Copenhagen , Copenhagen, Denmark
Abstract:Molecular reorientation of 2-chloropyrimidine dissolved in CS2 (0·1 M) has been investigated by means of 13C and proton relaxation. Although weakly coupled, the proton system subjected to non-selective 180-τ-90 pulse sequences allows the determination of one autocorrelation and one cross-correlation dipolar spectral density. The proton and carbon-13 relaxation data allow the complete determination of the rotational diffusional tensor:

 id=

and

 id=

It is shown that scalar relaxation due to nitrogen-14, has no effect on proton longitudinal relaxation time, because of a cross term due to the symmetry of the molecule, although this mechanism could, a priori, have been thought to be important. Finally, the nitrogen relaxation time recalculated with Dxx , Dyy , Dzz and the quadrupolar coupling tensor is in agreement with the observed linewidth.
Keywords:
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