The γ-radiolysis of hydrogen sulphide in the presence of : utadiene and carbon tetrachloride was studied. Addition of butadiene causes the slow diminishing inG(H2) and sharp lowering inG(S) from 7.1 for pure H2S down to 0.8 at all the used concentrations of butadiene. When carbon tetrachloride is added to hydrogen sulphide,G(H2) is not changed butG(S) increases by ΔG(S) ≈ 2. The presence of butadiene and carbon tetrachloride together allows to the same change in G(H2) as in the case of butadiene alone and lowering I(S) to zero. The ionic mechanism of molecular sulphur formation is proposed, consistent with the observed experimental facts.