Activation hardness

Definition:

_R  - absolute hardness of the reactant

_T  - absolute hardness of the transition state

References:

1. Z. Zhou, R.G. Parr, J. Am. Chem. Soc., 1990, 112, 5720.

2. R.G. Pearson, J. Org. Chem., 1989, 54, 1423.