An important distinction between explicit and interpolated surfaces have been reviewed focusing on the transformations occurring in the lower range of energies, the abstraction reaction and the inversion exchange reaction. The H+CH4 reaction and its isotopic variants have represented a target against which to test kinetics and dynamics theories and potential energy surface (PES) for polyatomic reactions. The review outlined the general description of the CH5 surface and describes possible reaction mechanisms, presents available experimental data for reactive system and methods of constructing potential energy surfaces, investigates PES with a special focus the methods for the CH5 system, and presents results of various theoretical investigations. As a conclusion, the quest for an accurate CH5 PES is achieving success due to similarity in features of accurate PES.
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The authors are grateful to Honghe Tobacco Co., Ltd for providing encouragement, the graceful environment for research and develop the system. The work was supported by Special