MAS double-quantum filtered dipolar shift correlation spectroscopy

A carbon-13 magic angle spinning double-quantum filtered dipolar shift corr elation NMR experiment which can be used to establish through-space connect ivities in solids is analyzed. The main advantage of the double-quantum fil tered approach is the removal of intensity arising from natural abundance b ackground signals. The variation in intensity of the cross and diagonal pea ks observed in the two-dimensional spectrum as a function of mixing time is investigated experimentally for model systems. The observed behavior is co mpared with analytical expressions derived for three coupled spins, as well as with simulations based on average Hamiltonian theory. (C) 2000 Academic Press.