The magnitude and importance of geometry relaxation effects for perfluoroalkyl radical combinations can be separately gauged entirely at the CASPT2/cc-pVDZ level, through the evaluation of the constrained rigid MEPs previously mentioned. In other words, the geometry relaxation component to the total correction is simply the difference between relaxed and rigid MEPs at CASPT2/cc-pVDZ as a function of the separation distance. The implications of this analysis are further discussed in Section 3.1.