IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Biomaterials Monday Sessions
       Session BI+SS-MoA

Paper BI+SS-MoA10
Proton Dynamics in Ice: A Resonant Photoemission Study

Monday, October 29, 2001, 5:00 pm, Room 102

Session: Role of Water in Biological Systems
Presenter: D. Nordlund, Uppsala University, Sweden
Authors: D. Nordlund, Uppsala University, Sweden
M. Cavalleri, University of Stockholm, Sweden
H. Ogasawara, Uppsala University, Sweden
L.-Å. Näslund, Uppsala University, Sweden
M. Nagasono, Uppsala University, Sweden
L.G.M. Petterson, University of Stockholm, Sweden
A. Nilsson, Uppsala University, Sweden and Stanford University
Correspondent: Click to Email
We have studied resonant photoemission around the O-K edge of ice. There is an interference effect between the direct photoemission and core decay processes seen in the valence orbitals. The most striking results is a binding energy shift of 0.5-1 eV of the valence states upon excitation into a core exciton at the bottom of the conduction band in ice. The shift in the orbital energies can be related to motions of the proton to the neighbouring water molecule connected through a donor H-bond during the lifetime of the core hole. This will give us a probe to study proton dynamics in H-bonded system on a femtosecond time scale. We are currently computing the potential of the proton in the core-excited state using DFT.