Abstract
The nature of hydrogen adsorption on thin platinum films at 78, 195, 273 and 298 K has been studied by means of sticking probability measurements and thermal desorption mass spectrometry (TDMS). A high value of the initial sticking coefficient ( S 0 ≈ 0.95) was found at all temperatures. The behaviour of the sticking probability S as a function of hydrogen coverage θ has been analyzed. Three TDMS peaks of hydrogen were detected on Pt films when the adsorption was carried out at 195 K. The TDMS analysis carried out for hydrogen adsorbed at 78 K, revealed the existence of a molecular form of hydrogen deposit.
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