Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 19: Metal substrates: Adsorption of O / H and inorganic molecules II
O 19.5: Vortrag
Montag, 14. März 2011, 18:15–18:30, WIL A317
Island growth of D2O on Ag(111) at low temperatures — •Sarah-Charlotta Heidorn, Cord Bertram, and Karina Morgenstern — Institut für Festkörperphysik, Abteilung ATMOS, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover
Water is well-known to form hydrogen-bonded networks on metal surfaces, even at low temperatures. We investigate the growth mechanism of D2O in the submonolayer range on Ag(111) with a low-temperature scanning tunneling microscope. Nucleation and island formation are studied during non-equilibrium growth processes for D2O pressures between 1·10−8 mbar and 1·10−6 mbar and sample temperatures between 17 K and 130 K. The island shapes are analyzed in dependence of temperature and deposition flux. At low deposition rates and low temperature, amorphous, round-shaped islands are formed. At high deposition rates and low temperature, the generated patterns are fractal. At low deposition rates and high temperature, compact islands are grown. Details of the observed structures and mechanism underlying the island formation will be discussed in the presentation.