Seifert, UdoDietrich, Siegfried2011-12-212016-03-312011-12-212016-03-31198736244210Xhttp://nbn-resolving.de/urn:nbn:de:bsz:93-opus-69424http://elib.uni-stuttgart.de/handle/11682/7815http://dx.doi.org/10.18419/opus-7798Activated processes at surfaces - like desorption or oxidation - exhibit thermal anomalies at phase transitions or the underlying substrate. Inter alia, such singularities in the case of a continuous transition are caused by the critical slowing down in the substrate, which leads to pronounced memory effects in the viscosity coefficient. Therefore, we apply a non-Markovian analog of Kramers' classical rate theory. As a result, the anomalies can be expressed in terms of critical exponents associated with the critical surface behaviour.eninfo:eu-repo/semantics/openAccessHedvall-Effekt , Magnetokatalytischer Effekt , Grenzflächenphysik530article