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About Energy Terms


Chronological Thread 
  • From: hongki@physics.utexas.edu
  • To: forum@abinit.org
  • Subject: About Energy Terms
  • Date: Tue, 7 Oct 2003 16:05:20 -0500

Hello ABINIT users,
I tried to test a really simple case such as a single atom in a big box but it
seems that the results of energy terms are not consistent except Hydrogen.
For example, in case of Hydrogen(H),energy terms are approximately
etotal -0.46~-0.47 (Ha)
kinetic 0.40
xc -0.23
for pspgth,pspnc and hgh pseudopotentials and those values agree with the
other
calculations such as LSD from the database of NIST
(http://physics.nist.gov/PhysRefData/DFTdata/Tables/ptable.html)
etotal -0.478671 (Ha)
kinetic 0.466643
xc -0.278072
However, in case of Lithium(Li)
1. pspgth
etotal -6.4459953871E+00
kinetic 4.64052708224207E+00
xc -1.39621419943090E+00
2. pspnc
etotal -2.4918288310E-01
kinetic 4.92291950692443E-02
xc -1.31155787732314E-01
3. hgh
etotal -2.1898809538E-01
kinetic 5.53895935658446E-02
xc -9.56485913178435E-02
4. LSD from Nist
etotal -7.343957
kinetic 7.249892
xc -1.665189
Results of other atoms show similar inconsistency.
I used the following options but I think even proper choice of options for
each
atom may not correct the huge difference of the results.

nspden 2
nsppol 2
nspinor 1
occopt 7
acell 3*15
ecut 15.0

Thank you.
Hongki Min



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