Axel,<br><br> Yes. You are right. By putting <br><br> <br> &XC_GRID<br> XC_DERIV SPLINE3_SMOOTH<br> &END XC_GRID<br><br> the error message went away. It seems that only a few derivative methods are supported by the XC functionals that I used.<br>
<br> Thanks.<br><br>Hanning<br><br><br><br><div class="gmail_quote">On Sat, Apr 18, 2009 at 3:49 PM, Axel <span dir="ltr"><<a href="mailto:akoh...@gmail.com">akoh...@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im"><br>
<br>
<br>
On Apr 18, 2:22 pm, Hanning Chen <<a href="mailto:chenh...@gmail.com">chenh...@gmail.com</a>> wrote:<br>
</div><div class="im">> Dear CP2K users,<br>
><br>
> I ran a TDDFPT calculation for excitation energies using PBE as my XC<br>
> functionals. I encountered an error "Please provide a derivation method<br>
> 12:50:04 ERRORL2 in pw_poisson_methods:pw_poisson_solve err=-300 12:50:06<br>
> ERRORL2 in xc:xc_calc_2nd_deriv err=-300 condition FAILED". I guess that<br>
> was caused by a missing parameter for the second derivative of the XC terms.<br>
> Please help me to resolve this issue.<br>
<br>
</div>a little grepping through the sources reveals that you should have a<br>
look at:<br>
<a href="http://cp2k.berlios.de/manual/CP2K_INPUT/FORCE_EVAL/DFT/XC/XC_GRID.html#desc_XC_DERIV" target="_blank">http://cp2k.berlios.de/manual/CP2K_INPUT/FORCE_EVAL/DFT/XC/XC_GRID.html#desc_XC_DERIV</a><br>
<br>
i don't much about TDDFT, but my guess is that there is no analytical<br>
2nd derivative<br>
for the functional that you are using, so you'd have to use a<br>
numerical method.<br>
<br>
have you compared your input to existing test cases?<br>
<font color="#888888"><br>
axel.<br>
</font><div class="im">><br>
> Thanks.<br>
><br>
> Hanning Chen<br>
><br>
> Department of Chemistry<br>
> Northwestern University<br>
> Evanston, IL 60208<br>
</div><div><div></div><div class="h5"><br>
</div></div></blockquote></div><br>