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Long-lived states (LLS) involving pairs of magnetically inequivalent butchemically equivalent proton spins in aliphatic (CH$_2$)$_n$ chains can beexcited by simultaneous application of weak selective radio-frequency (RF)fields at n chemical shifts by polychromatic spin lock induced crossing(poly-SLIC). The LLS are delocalized throughout the aliphatic chain by mixingof intrapair singlet states and by excitation of LLS comprising products offour or six spins. The measured lifetimes T$_{LLS}$ in a model compound areabout 5 times longer than T1, and are strongly affected by interactions withmacromolecules.

Polychromatic Excitation of Delocalized Long-Lived Proton Spin States in Aliphatic Chains