<div dir="ltr"><br clear="all"><div>Dear experts,</div><div><br></div><div>I am trying to calculate the adsorption energy of pentane molecule on top of TiO2 anatase (101) surface. I started with different geometry creating 4 input files. However, only one job has been terminated normally. </div><div>The other three jobs I got such error:</div><div><div>"Error in routine bfgs (1): dE0s is positive which should never happen".</div></div><div>I have read in former posts that error comes when the starting geometry of structure is close to the minimum. </div><div>However, since I am not sure about that, I would like to know your opinion. In the following link you can find the input and the output files:</div><div><br></div><div><a href="https://www.dropbox.com/sh/24zff4wqs6qg34z/AACg49Yzlp0EQGEtsI6UtuCBa?dl=0">https://www.dropbox.com/sh/24zff4wqs6qg34z/AACg49Yzlp0EQGEtsI6UtuCBa?dl=0</a></div><div><br></div><div>Any suggestions regarding my input files are really very welcome since I am a beginner user of QuantumEspresso. </div><div><br></div><div>Thanks.</div><div><br></div><div>Best regards,</div><div><br></div><div>Paolo</div><div> </div><div><br></div>-- <br><div class="gmail-m_-8721835023691498515gmail_signature"><div dir="ltr">Paolo Costa, Ph.D.<div>Postdoctoral Researcher</div><div>Department of Chemistry and Biomolecular Sciences</div><div>University of Ottawa</div><div>10 Marie Curie, Ottawa, ON K1N 6N5, Canada</div><div>Room number: DRO 326 (D'Iorio Hall)</div></div></div>
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