caa a22 4500 463211340 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s00339-007-4057-y doi (NATIONALLICENCE)springer-10.1007/s00339-007-4057-y Photodesorption from ultra-thin metal films - a comparison of SO2 and NO2 on Ag/Si(100) [Elektronische Daten] [C. Wesenberg, O. Autzen, E. Hasselbrink] The photochemistry of SO2 on thin epitaxial Ag films (5-60nm) deposited on Si(100) has been studied using laser light with the wavelengths of 266, 355, and 532nm. SO2 desorbs with cross sections of 1.7×10-19,1.7×10-20 and 2.9×10-21cm2, respectively. The average translation energy, 〈Etrans/2k〉, is 440K for 266 and 355nm light, and 270K for 532nm light. Cross sections for a 60nm thick Ag film are practically identical to the ones for Ag(111) as the substrate. An increase by a factor of ∼3.5 is observed when the film thickness is reduced to 5nm for 266 and 355nm light. No significant change is observed for 532nm excitation. The film thickness has no significant influence on the translational energy of the photodesorbed molecules. The data are discussed in connection with the change of absorptivity of the metal film-semiconductor system. A model is put forward which takes into account the light absorption in the Si substrate and the reduced relaxation of excited electrons in Si. Modelling indicates that electrons excited in the Si substrate with energies and parallel momenta not allowed in Ag contribute to the surface chemistry after crossing the gap in the projected band structure of Ag(111). Springer-Verlag, 2007 Wesenberg C. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut Autzen O. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut Hasselbrink E. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut Applied Physics A Springer-Verlag 88/3(2007-08-01), 559-569 0947-8396 88:3<559 2007 88 339 https://doi.org/10.1007/s00339-007-4057-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-4057-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wesenberg C. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut NATIONALLICENCE 700 1- Autzen O. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut NATIONALLICENCE 700 1- Hasselbrink E. Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, 45117, Essen, Germany aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/3(2007-08-01), 559-569 0947-8396 88:3<559 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer