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About Geometry Optimization


Chronological Thread 
  • From: "Ramirez-Cuesta, AJ (Timmy) " <A.J.Ramirez-Cuesta@rl.ac.uk>
  • To: "'forum@abinit.org'" <forum@abinit.org>
  • Subject: About Geometry Optimization
  • Date: Fri, 13 Jun 2003 09:32:18 +0100

Hi there!
I found a very unexpected behavoiur when using "getcell" and "getxred".
I generated the primitive cell and optimized the geometry, including cell
relaxation, with getcell=-1 and getxred=-1. After the geometry relaxation
concluded DATASET 2 reads the new geometry and cell and calculates the
wavefucntions and densities at equilibrium do I can start the phonon
calculations.
In DATASET 3 it says, that is going to take the output of the previous
dataset but instead it prints the initial geometry!! See below, any hints?

== DATASET 1
==================================================================

Real(R)+Recip(G) space primitive vectors, cartesian coordinates
(Bohr,Bohr^-1):
R(1)= 3.3210659 1.9174183 8.6972500 G(1)= 0.1505541 0.0869224
0.0383263
R(2)= -3.3210659 1.9174183 8.6972500 G(2)= -0.1505541 0.0869224
0.0383263
R(3)= 0.0000000 -3.8348365 8.6972500 G(3)= 0.0000000 -0.1738449
0.0383263
Unit cell volume ucvol= 3.3229787E+02 bohr^3
!!!!! Volume before optimizing
Angles (23,13,12)= 4.09007504E+01 4.09007504E+01 4.09007507E+01 degrees



== DATASET 2
==================================================================

driver : getcell/=0, take acell and rprim from output of dataset with index
1.

driver : getxred/=0, take xred from output of dataset with index 1.

Real(R)+Recip(G) space primitive vectors, cartesian coordinates
(Bohr,Bohr^-1):
R(1)= 3.3187635 1.9160841 8.6936963 G(1)= 0.1506585 0.0869827
0.0383420
R(2)= -3.3187635 1.9160841 8.6936963 G(2)= -0.1506585 0.0869827
0.0383420
R(3)= 0.0000000 -3.8321877 8.6937006 G(3)= 0.0000000 -0.1739653
0.0383418
Unit cell volume ucvol= 3.3170203E+02 bohr^3
!!!!! Volume after optimizing
Angles (23,13,12)= 4.08905728E+01 4.08905728E+01 4.08905659E+01 degrees



== DATASET 3
==================================================================

mkfilename : getwfk/=0, take file _WFK from output of DATASET 2.

mkfilename : getden/=0, take file _DEN from output of DATASET 2.

driver : getcell/=0, take acell and rprim from output of dataset with index
2.

driver : getxred/=0, take xred from output of dataset with index 2.

Real(R)+Recip(G) space primitive vectors, cartesian coordinates
(Bohr,Bohr^-1):
R(1)= 3.3210659 1.9174183 8.6972500 G(1)= 0.1505541 0.0869224
0.0383263
R(2)= -3.3210659 1.9174183 8.6972500 G(2)= -0.1505541 0.0869224
0.0383263
R(3)= 0.0000000 -3.8348365 8.6972500 G(3)= 0.0000000 -0.1738449
0.0383263
Unit cell volume ucvol= 3.3229787E+02
bohr^3 !!!!! Volume before
optimizing
Angles (23,13,12)= 4.09007504E+01 4.09007504E+01 4.09007507E+01 degrees
setup1 : take into account q-point for computing boxcut.

It can be seen that IT REVERTS to the initial configuration!!!


The Goemetry is defined



acell 3*1
rprim
3.3210659 1.9174183 8.6972500
-3.3210659 1.9174183 8.6972500
0.0000000 -3.8348365 8.6972500

natrd 4
xred
0.000000000000 0.000000000000 0.000000000000
0.500000000000 0.500000000000 0.500000000000
0.414195026043 0.414195026043 0.414195026043
0.585804973957 0.585804973957 0.585804973957




Thanks


-------------------------------------------
Dr. Anibal Javier Ramirez-Cuesta
ISIS Facility
Rutherford Appleton Laboratory
Building R3, Room 1-42
Chilton
Didcot
Oxon
OX11 0QX
UNITED KINGDOM
email: a.j.ramirez-cuesta@rl.ac.uk

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--------------------------------------------

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