title: Oxygen K-edge X-ray absorption fine structure studies of vacuum-deposited ice films.
abstract: Multilayer ice films deposited on polycrystalline Au(111) substrates at 90 and 153 K under ultra-high-vacuum conditions are studied using O K-edge X-ray absorption fine structure spectroscopy in the surface-sensitive partial electron yield mode. Both near-edge and extended oscillatory fine structures are analyzed in combination with the theoretical real-space full-multiple-scattering simulations based on the FEFF8 code. The experimental data consistently indicate that the local structure of the near-surface regions in ice films at both substrate temperatures resembles that of high-density crystalline modifications of ice (e.g., ice II, ice III, or high-density amorphous ice). In addition, the ice films deposited at 153 K most probably contain a minor fraction of low-density cubic ice (I(c) phase).
authors.affiliation: Angewandte Physikalische Chemie, University of Heidelberg, INF 253, 69120 Heidelberg, Germany. yan.zubavichus@urz.uni-heidelberg.de
authors.forename: Yan
authors.initials: Y
authors.lastname: Zubavichus
authors.forename: Michael
authors.initials: M
authors.lastname: Zharnikov
authors.forename: Yong-Jie
authors.initials: YJ
authors.lastname: Yang
authors.forename: Oliver
authors.initials: O
authors.lastname: Fuchs
authors.forename: Eberhard
authors.initials: E
authors.lastname: Umbach
authors.forename: Clemens
authors.initials: C
authors.lastname: Heske
authors.forename: Michael
authors.initials: M
authors.lastname: Grunze