<div style>Hello Oliviero,</div><div style><br></div><div style>I would like to be sure that you read this article: <a href="http://link.aip.org/link/doi/10.1063/1.471933" target="_blank" style="color:rgb(17,85,204)">http://link.aip.org/link/doi/10.1063/1.471933</a></div>
<div style>and several related references  cited therein about problems with negative ions in DFT.</div><div style><br></div><div style>Best regards,</div><div><br></div>-- <br>Goranka Bilalbegovic <br>Department of Physics, Faculty of Science, <br>
University of Zagreb, Croatia<br>