<HTML><BODY>Hi all!<br><br>I am new to Pwscf and to this forum. I have a question about pseudopotential for silver: if I calculate the energy of pure silver atom and its cation in vacuum then they (energies) are ok. But if I optimize the structure Ag_surface (when Ag or its cation adsorped on a dielectric surface, for example, SiO2), then the absolute value of charged Ag+_surface energy is greater than the absolute value of neutral Ag_surface energy. Could you please tell me how it could be? I used <span class="grigio"><a class="aranciolink" href="http://www.quantum-espresso.org/pseudo/1.3/UPF/Ag.pbe-d-rrkjus.UPF" data-mce-href="http://www.quantum-espresso.org/pseudo/1.3/UPF/Ag.pbe-d-rrkjus.UPF">Ag.pbe-d-rrkjus.UPF</a>.</span><br><br>Thank you in advance!<br><br>Best regards,<br>Nikita<br data-mce-bogus="1"></BODY></HTML>