where E a is the enthalpic energy of activation. Hence, all pressure dependence terms are inherently defined in the P V a term, the pressure times the volume of activation. For condensed phase chemistry, it was shown that both pressure and deviatoric stress components can be contributing factors, and the P V a term is expanded into tensorial quantities: P V a = σ : ϵ = pv a + σ : εa where non-tilde terms are 3x3 tensors and tilde terms are the traceless reductions. Here, we will use this same notion to describe the effect on the activation barrier from the internal molecular stresses and strains.