RRKM Theory Calculation of the Unimolecular Decomposition of Hexafluoroethane: Thermal Activation

摘要

The thermal decomposition of hexafluoroethane is discussed in terms of the quantumhyphen;statistical RRKM theory of unimolecular reactions. The falloff behavior is calculated at several temperatures using the approximate rotationndash;vibration energyhyphen;level sums of Whitten and Rabinovitch. A very loose, Gorinhyphen;type activated complex model with five active internal rotations is found to be consistent with earlier shockhyphen;tube results. Centrifugal effects, associated with a significant extension of the critical bond length in the activated complex, are found to be important and must be taken into account. The approximate method is also applied to C2H6and satisfactory agreement is found with previous exact computations.