In 1995 , M. Räsänen and coed @-@ workers , scientists at the University of Helsinki in Finland , announced the preparation of xenon dihydride ( HXeH ) , and later xenon hydride @-@ hydroxide ( HXeOH ) , hydroxenoacetylene ( HXeCCH ) , and other Xe @-@ containing molecules . In 2008 , Khriachtchev et al. reported the preparation of HXeOXeH by the photolysis of water within a cryogenic xenon matrix . Deuterated molecules , HXeOD and DXeOH , have also been produced .