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gechaoyi

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[求助] 计算N2键长问题

我按照教程中计算H2键长的方法,计算了下N2的键长,但是不知道为什么计算结果跟实验值差距很大,麻烦高手帮我看下,是不是我的参数设置问题,求指导~
ixc 11
acell 31 31 31
ecut 35
natom 2
ionmov 3
ntime 10
tolmxf 5.0d-4
xcart -0.5 0.0 0.0
       0.5 0.0 0.0
toldff 5.0d-5
nband 7
ntypat 1
znucl 7
typat 1 1
kptopt 0
nkpt 1
nstep 100
diemac 2.0
optforces 1
以上是我的in文件,我的计算结果是:
  xcart     -4.1174371324E+01 -1.1163650220E-30 -1.5445304779E-30
                4.1174371324E+01  1.1163650220E-30  1.5445304779E-30
实验值是1.09埃
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