Two-dimensional Two Contact Double Resonance Spectroscopy

A two-dimensional spectroscopic technique is presented. Application of the technique to determine all the relaxation rates for a multi-level quadrupole system is discussed along with experimental requirements. Theoretical and experimental data are analyzed for theN, three level, spin 1 system. The analysis shows that all three relaxation rates can be obtained from a single two-dimensional spectrum, and that only 3 peaks in the 3 3 two-dimensional intensity matrix are needed to completely specify the problem. The 4-level spin 3/2 system is also examined. In theory, all six relaxation rates can be independently evaluated (for a suitable system) without necessitating measurement at the low frequency Zeeman separated levels.