Abstract
When 235 U m nuclei are deposited on a metallic surface, they exhibit two distinct nuclear decay constants, corresponding most probably to chemisorbed atoms and to physisorbed oxide molecules, respectively. In addition, when the 235 U m source is placed under vacuum, the analysis of the decay rate of the surface activity can yield the mean sticking time and the heat of adsorption of the physisorbed molecules; it also gives information on the conversion electron spectrum of the desorbing 235 U m nuclei. Results obtained with 235 U m adsorbed on Pt, Cu and Ti are presented.
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