Hello!<br />What you get is the electronic energy, which is roughly equivalent to the internal energy U. If you want the enthalpy H or free energy (G or F) you need a frequency calculation to get the vibrational entropy. <div>Take care!</div><div>Q. </div><div class="gmail_quote"><div dir="auto" class="gmail_attr">Le mercredi 19 février 2025 à 13:33:07 UTC+1, Oksana Grinevich a écrit :<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hello everyone!<div><br></div><div>I calculate energies for systems 'molecule+graphene sheet'. I use GTH pseudopotentials, PBE functional, and D3 Grimme approach. After calculating total energies of the bonded system, I calculate energies for lone molecule and lone graphene. After this action (E for bonded - E for lone graphene - E for lone molecule) I get the energy that can be assosiated with the adsorption energy.</div><div><br></div><div>So, my question is what kind of energy I obtain in it? Is it dG (which includes both enthalpy+entropy components) or it's only the enthalpy? </div><div><br></div><div>Can I also understand the type of forces (electrostatic or specific one) through these calculation only?</div><div><br></div><div>Thank you for advance. </div></blockquote></div>
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