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Abstract:
We have investigated the phenomenon of readsorption after pulsed‐laser induced thermal desorption during the presence of ambient gas. The temporal evolution of the readsorption of water has been measured as a function of the ambient gas pressure for helium and carbon‐dioxide atmospheres. CO2pressures above 10 mbar lead to a virtually complete readsorption of the desorbed material. A model based on a nearly one‐dimensional diffusion scheme explains this remarkable result.