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cenwanglai: »ØÌûÖö¥ 2012-09-22 16:49:38
fzx2008: ½ð±Ò+3, лл·ÖÏí 2012-09-23 16:30:23
cenwanglai: »ØÌûÖö¥ 2012-09-22 16:49:38
fzx2008: ½ð±Ò+3, лл·ÖÏí 2012-09-23 16:30:23
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¸ø×÷Õß·¢ÓʼþÎÊÁË£¬ÎÊÌâºÍ»Ø¸´ÈçÏ£º 1. Why the ENCUT = 409 eV is used? How dit you get the value 409? ENCUT=409eV corresponds to the cutoff used for Cl in the "hard" pseudopotential (Cl_h). If you looked for the keyword "ENMAX" into the POTCAR file corresponding to the hard Cl pseudopotential, you'll get: ENMAX = 409.136 To avoid comparing calculations obtained using different basis sets (e.i., different cutoff for the plane waves expension), we explicitly set ENCUT=409 in all the calculations including those not involving Cl (for instance the oxygen molecule in the gas phase). > 2. The number of unpaired electrons (Ns) was considered. How can you assign the Ns and fix it during geo optimaztion? Could you please show me the corresponding TAG in INCAR or other ways to make it? The number of unpaired electrons is fixed by the keyword "NUPDOWN". For instance "NUPDOWN=1" in the INCAR file means Ns=1 in the paper. The value of "NUPDOWN" appears in the "OSZICAR" and "out" files after each electronic minimization. Look at the number given after "mag" (for instance "mag= 0.0000" means "NUPDOWN = 0" . If you don't set thevalue of "NUPDOWN" in the INCAR file, VASP will compute the magnetization automatically. The problem with this approach is that the total magnetic moment may vary from one step to another during the geometry optimization. Personally, I prefer to fix NUPDOWN during the calculation and try different value of NUPDOWN. This ensure that I get the lowest "spin state" for a given geometry. Furthermore, this approach ensure the fulfilment of the "spin conservation" (see S. Chretien and H. Metiu J. Chem. Phys. 129(7), 074705 (2008)). |
8Â¥2012-09-22 16:49:15
fzx2008
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liliangfang: ½ð±Ò+2, лл½»Á÷ 2012-09-22 10:53:56
cenwanglai: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, лл»Ø¸´¡£409ÊÇClµÄhardÊÆÀïÃæµÄENMAX. 2012-09-22 16:53:46
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liliangfang: ½ð±Ò+2, лл½»Á÷ 2012-09-22 10:53:56
cenwanglai: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, лл»Ø¸´¡£409ÊÇClµÄhardÊÆÀïÃæµÄENMAX. 2012-09-22 16:53:46
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2Â¥2012-09-22 00:37:48
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liliangfang: ½ð±Ò+2, лл½»Á÷ 2012-09-22 10:54:02
cenwanglai: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл»Ø¸´~ 2012-09-22 17:02:42
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liliangfang: ½ð±Ò+2, лл½»Á÷ 2012-09-22 10:54:02
cenwanglai: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú, ¸Ðл»Ø¸´~ 2012-09-22 17:02:42
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3Â¥2012-09-22 06:35:22
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4Â¥2012-09-22 08:07:17









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