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The radiation-induced transformations of isolated dimethyl disulphide molecules in a solid argon matrix occurring under the action of X-rays at 4.5 K were studied by FTIR spectroscopy. It was shown that decomposition was quite efficient (the corresponding radiation-chemical yield of Me 2 S 2 degradation was estimated as 4.5 molecules per 100 eV). The radiolysis proceeds via two primary channels yielding CH 3 SH plus H 2 CS and CH 4 plus H 2 CSS, respectively. These two channels of dimethyl disulphide decay during radiolysis lead to various secondary products appearing during prolonged radiolysis. Spectroscopic characteristics of the observed products and possible implications of the results are discussed. • Efficient radiolysis of isolated dimethyl disulphide molecules in solid argon was showed. • Two primary channels of radiolysis of dimethyl disulphide molecules were discovered. • With prolonged radiolysis of dimethyl disuphide molecules, a variety set of products is discovered. [ABSTRACT FROM AUTHOR]