Hello CP2K users,<div><br /></div><div>Recently I was looking into the excited state forces using CP2K. To do this, I performed the <b>DFPT</b> calculation with <b>RUN_TYPE</b> set to <b>ENERGY_FORCE</b>.</div><div><br /></div><div>There are two options to print forces:</div><div>1) https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/PRINT/FORCES.html</div><div>2) https://manual.cp2k.org/trunk/CP2K_INPUT/MOTION/PRINT/FORCES.html</div><div><br /></div><div>a) When I used option #1, it does output the force, not sure if it is the excited state forces.</div><div>b) When I used option #2, it doesn't output any force. </div><div>c) When I turned off the DFPT and did the ground state calculation, it gives the same force as a). </div><div><br /></div><div>So my question is:</div><div> which option is true to print force? what's the difference between the two options? </div><div> whether the approach (DFPT & option #1) I used true to obtain the excited state forces?</div><div><br /></div><div>Regards</div><div>Wei</div><div><br /></div>
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