Temperature controled photoelectron spectroscopic investigation of volatile species on PhS(100) surface

A special sample precooling technique has been utilised to preserve thin la yers of volatile chemical species on the sample surface in ultra high vacuu m conditions for investigation with conventional and synchrotron excited ph otoelectron spectroscopy. The precooling system has been constructed for th e Scienta 300 electron spectrometer at the beam line 51 at MAX I synchrotro n laboratory in Lund (Sweden) and it will be transferred to beam line 411 a t the new MAX II storage ring. The spectrometer also includes a possibility for continuous temperature control of the sample during the measurement at temperature range 70 K - 450 K. In this work, temperature controlled measu ring technique has been applied in a study of electrochemically treated PbS (100) surface. The measured sulfur 2p core level spectra clearly reveal a layer structure of elemental sulfur and metal polysulfides formed during an odic oxidation of PbS in acidic aqueous solution. Similar measuring techniq ue can also be applied, e.g., in studies of adsorption layers on various su bstrates.