Cross-correlation between pairs of dipole-dipole interactions may lead to a partial conversion of longitudinal Zeeman magnetization into longitudinal three-spin order, which can be obsd. selectively by using a triple-quantum filter in conjunction with two-dimensional exchange expts. The resulting TQF-NOESY method (triple-quantum filtered nuclear Overhauser effect spectroscopy) provides information about angles subtended by internuclear vectors. [on SciFinder (R)]