
%0 Journal Article
%A Separovic, Frances 
%A Skrynnikov, Nikolai R. 
%A Sanctuary, Bryan C. 
%T Selective On-Resonance N.M.R. Irradiation of a Dipolar Double.
%J Australian Journal of Chemistry
%D 2000/07/21
%V 53
%N 4
%P 355-361
%K Multiple-quantum n.m.r.; Raman n.m.r.; selective excitation; operator basis; multipole representation; dipolar coupling; difluorotetrachloroethane.
%R https://doi.org/10.1071/CH00044
%U https://www.publish.csiro.au/paper/CH00044 
%X Raman magnetic resonance where double-quantum transitions are observed without the need for multidimensional n.m.r. spectroscopy has been investigated further. Theoretical analysis of the on-resonance case where weak continuous-wave irradiation was applied at the frequency of a single-quantum transition was performed and guidelines for a consistent perturbation treatment were devised. Theoretical results agree well with experimental data obtained for a system of two dipolar coupled nuclei of spin oriented by a liquid crystal. The same approach is applicable to near-resonance experiments which are shown to be the optimal experimental scheme for Raman n.m.r. By using weak selective irradiation, a symmetric excitation&#8211;detection scheme can be realized for multiple-quantum n.m.r. experiments. Near- or on-resonance selective irradiation provides an efficient transfer of multiquantum coherence into observable coherences and could be used to study multiquantum relaxation processes. 
