Here, the processes of photo-association and absorption charge-exchange in He+H~+ collisions together with the process of molecular ion HeH~+ photo-dissociation are considered as factors of influence on the opacity of the atmospheres of helium-rich white dwarfs in the far UV region. It is shown that they should be taken into account even in the cases of the atmospheres of white dwarfs with H:He = 10~(-5). Also, it is established that in the cases of white dwarfs with H:He approx.> 10~(-4), especially when H:He ≈ 10~(-3), these processes have to be included ab initio in the corresponding models of their atmospheres.
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