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As a continuation of the previous investigations of the symmetric andstrongly non-symmetric ion-atom absorption processes in the far UV regionwithin the models of the quiet Sun photosphere, these processes are studiedhere within a model of the sunspot. Here we mean the absorption processes inthe H$(1s)$+H$^{+}$ and H$(1s)+X^{+}$ collisions and the processes of thephoto-dissociation of the H$_{2}^{+}$ and H$X^{+}$ molecular ions, where $X$ isone of the metal atoms: $X=$Na, Ca, Mg, Si and Al. Obtained results show thatthe influence of the considered ion-atom absorption processes on the opacity ofsunspots in the considered spectral region (110 nm $\lesssim \lambda \lesssim$230 nm) is not less and in some parts even larger than the influence of thereferent electron-atom processes. In such a way, it is shown that theconsidered ion-atom absorption processes should be included \emph{ab initio} inthe corresponding models of sunspots of solar-type and near solar-type stars.Apart of that, the spectral characteristics of the considered non-symmetricion-atom absorption processes (including here the case $X$ = Li), which can beused in some further applications, have been determined and presented withinthis work.

The ion-atom absorption processes as one of the factors of the influence on the sunspot opacity