Double-quantum-filtered intermolecular single-quantum coherences in nuclear magnetic resonance spectroscopy and imaging

Intermolecular single-quantum coherence signals with different gradient orientations: ϕ = 0° (left), ϕ = 54.7° (middle), and ϕ = 90° (right). (a) optimal RF pulses, and (b) pulse angles deviated by a factor of 2/9. The residual conventional signals due to imperfect flip angles are effectively removed.