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from ase.calculators.emt import EMT
from ase.constraints import FixAtoms
from ase.io import read
from ase.mep import NEB
from ase.optimize import BFGS
initial = read('initial.traj')
final = read('final.traj')
constraint = FixAtoms(mask=[atom.tag > 1 for atom in initial])
images = [initial]
for i in range(3):
image = initial.copy()
image.calc = EMT()
image.set_constraint(constraint)
images.append(image)
images.append(final)
neb = NEB(images)
neb.interpolate()
qn = BFGS(neb, trajectory='neb.traj')
qn.run(fmax=0.05)
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