Dear Manjusha
activation energy (->) = 0.000000 eV
activation energy (<-) = 0.000000 eV
image energy (eV) error (eV/A) frozen
1 -64917.3691663 3.118784 T
2 -64919.6863336 2.357326 F
3 -64918.3306026 3.752568 F
4 -64918.3307659 3.754808 F
5 -64919.6865281 2.355640 F
6 -64917.3691661 3.119165 T
path length = 7.684 bohr
inter-image distance = 1.537 bohr
It seems that your first and last images are not potential energy
minima. Try to optimize their geometry and check if, after
optimization, they are still what you expect. Then perform the neb
calculation.
HTH
Giueppe
Giuseppe Mattioli
ISM-CNR
Italy
Quoting manchugh at iitk.ac.in:
> Dear all
>
> I am doing NEB calculation to find the MEP between two states using
> version neb-5.0.2. First, I want to get the path trajectory using no-CI
> and after 10-15 iterations, if the path trajectory is stabilized, I will
> use CI. But after 2nd iteration in my no-CI calculation, I am getting zero
> activation energy. My system is Ga terminated surface of GaN(0001) and one
> N atom is diffusing from one fcc site to another for which I am
> calculating MEP.
> Input and output files are attached. (The output is not complete since job
> is still running). Can anyone clarify why activation energy is zero?
>
> Thank you for your time
> Manjusha
> IIT Kanpur
> India
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