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These supplementary thermal corrections are beyond the routine procedure to calculate the physical pressure value.
This occurs even for the gas-phase structures, including or not thermal corrections.
B3LYP/6-31G* B3LYP/6-31G*ointstationaryn confirmed with frequency calculations (at 310 K and 1 atm) allowing thermal corrections and IR spoints to be evaluated.
Thermal corrections to Gibbs free energies were calculated for 338.15 K, which is the temperature at which the reactions were performed experimentally.
On adding zero-point vibrational energy (1.5 kcal/mol) and thermal corrections (-1.0 kcal/mol), we obtain a contribution of 9.9 kcal mol−1 that needs to be added to the potential energies to obtain free energy differences.
Our methodology differs slightly from their method because we did not use a pseudopotential for Br, did not scale computed frequencies when evaluating zero-point and thermal corrections, and we assumed a temperature of 298 K vs. 250 K (though this difference has a negligible impact).
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