Selective ion fixing during the structural relaxation

[bradraj]

Is it possible in abinit to fix selective ions in the unit cell during the structural relaxation ?

If a ion like hydrogen is present, which is very naughty and doesn't allow the convergence during structural relaxation.

I would like to fix the hydrogen atom and given freedom to the remaining atoms in the unit cell.

[Annelinde]

This is possible https://docs.abinit.org/variables/rlx/#natfix