The Heteronuclear Multiple-Quantum Correlation Experiment: Perspective from Classical Vectors, Nonclassical Vectors, and Product Operators

Figure 3

Simple representation of offset evolution of Multiple-Quantum Coherence (MQC) during the evolution period. Observe how Double-Quantum Coherence (DQC) evolves at while Zero-Quantum Coherence (ZQC) evolves at . The pulse to protons converts DQC into ZQC and vice versa, thus leading to cancellation of ; therefore, the final output of the evolution period is [40].