<div>Hello,</div><div><br /></div><div>I would like to use the PBE50 functional. I followed the tutorial provided on the website (https://www.cp2k.org/exercises:2017_uzh_cp2k-tutorial:hybrid) where the PBE50 functional is created by manually tuning the PBE and HF contributions,</div><div><br /></div><div> &XC<br /> &XC_FUNCTIONAL<br /> &PBE<br /> SCALE_X 0.50<br /> SCALE_C 1.0<br /> &END PBE<br /> &END XC_FUNCTIONAL<br /> &HF<br /> FRACTION 0.50<br /> &END HF<br /> &END XC<br /></div><div><br /></div><div>However, within the manual, there seems to be a separate way to call the PBE50 functional from the LibXC library by simply saying <br /></div><div><br /></div><div> &XC<br /> &XC_FUNCTIONAL<br /> &HYB_GGA_XC_PBE50<br /> &END HYB_GGA_XC_PBE50<br /> &END XC_FUNCTIONAL<br /> &END XC</div><div><br /></div><div>
without the need to manually specify the HF contribution. I ran both approaches with a single water molecule to compare, and I got different energies. Also, just using the HYB_GGA_XC_PBE50 approach did not result in the "Hartree Fock exchange energy" being printed in the output.<br /></div><div><br /></div><div>Which method is the correct approach? If its the first, how does the HYB_GGA_XC_PBE50 functional work? I am using the 2022.1 version of CP2K with the 4.1.4 version of OpenMPI.<br /></div><div><br /></div><div>I've attached the output files to this post. The one for manually setting PBE50 is named <br />"water_manual.out" and the one where I just set the functional as HYB_GGA_XC_PBE50 is called "water_hyb.out." If I need to upload my input files as well, please let me know!</div><div><br /></div><div>Thank you!</div><div><br /></div><div>Mikhayla Clothier<br /></div>
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