The spin coherence relaxation in the rotating frame as a microscopy parameter for strongly coupled spin systems

The transverse relaxation time in the rotating frame T-2p is proposed as an effective parameter to get specific contrast in solid state imaging. Several peculiarities make T-2p an interesting candidate to map dynamics and structure in solids: the effect of the secular spin interaction can be controlled by the experimenter and therefore the relaxation associated with the nonsecular terms, which is particularly sensitive to very slow dynamics, can be observed, In this paper we present preliminary results obtained on polymers and prove the capability of the MARF Imaging enhanced by a filter based on rotary echo refocusing, to produce images of solids contrasted by T-2p. (C) 1999 Academic Press.