The laser irradiation at 193 nm of a gaseous mixture of carbon disulfide and ethene induces the copolymerization of both compounds and affords the chemical vapour deposition of a C/S/H polymer, the composition of which indicates the reaction between two to three CS2 molecules and one C2H4 molecule. Polymer structure is interpreted on the basis of X-ray photoelectron and FT-IR spectra as consisting of >C=S, >C=C<, -CH2-CH2-, (C=C)SnC4 - n, -C-(C=S)-S-, -S-(C=S)-S-, and C-S-S-C configurations. The gas-phase copolymerization of carbon disulfide and ethene represents the first example of such a reaction between carbon disulfide and a common monomer.