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The temperature dependence of the site lifetimes, tA and tB, characterizing the intermolecular exchange of X between sites A and B through simultaneous first-order and second-order processes as expressed in the rate law 1/tA = XB/XAtB = k1 + k2[B] and the treatment of such data determined by nuclear magnetic resonance spectroscopy are discussed.

Site lifetime temperature variations in intermolecular exchange processes characterized by a two-term rate law