long-lived collision complex

When a potential-energy surface is such that the system performs a number of vibrations and rotations in the region of a @[email protected], the corresponding @[email protected] is known as a long-lived @[email protected], and the reaction is said to be indirect.
PAC, 1981, 53, 753. (Symbolism and Terminology in Chemical Kinetics) on page 767 [Terms] [Paper]