24小时热门版块排行榜    

查看: 460  |  回复: 2
当前主题已经存档。

nature617

银虫 (小有名气)

[交流] [求助]请教VASP输出问题

请教各位虫子:
在VASP输出文件中,最后输出三个能量,如下:

free  energy   TOTEN  =      -115.096591 eV

energy  without entropy=     -115.131424  energy(sigma->0) =     -115.108202

请教上述free  energy   TOTEN,energy  without entropy, energy(sigma->0)含义?此处那个energy  without entropy里面熵是指什么熵呢?熵不是要乘以温度才能与内能相减吗?

[ Last edited by wuchenwf on 2009-6-21 at 20:21 ]
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

cuihang

铁杆木虫 (正式写手)

VASPer

★ ★ ★
zzgyb(金币+3,VIP+0):谢谢你的参与,欢迎继续关注计算模拟版!
the relevant energy for molecules and atoms is energy without entropy
energy without entropy= -0.005752 energy(sigma->0) = -0.160014
three degenerate p orbitals are occupied by 2/3 electrons causing a unphysical
electronic entropy
entropy T*S EENTRO = -0.30852464
a tiny value for SIGMA=0.01 would reduce the entropy but might slow convergence
(default is SIGMA=0.2)
SIGMA controls the electronic temperature, which is not a very meaningful quantity
for molecules and atoms the total energy is found to be essentially zero
VASP subtracts from any calculated energy the energy of the atom in the
configuration for which the pseudopotential was generated
all pseudopotentials were generated using non spin polarized reference atoms
聪明人知道自己是傻子,傻子以为自己是聪明人
2楼2008-05-06 10:01:57
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

nature617

银虫 (小有名气)

感谢二位帮助
3楼2008-05-07 08:12:35
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 nature617 的主题更新
普通表情 高级回复 (可上传附件)
信息提示
请填处理意见