Ultrafast molecular dissociation of water in ice |
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Authors: | Brena B Nordlund D Odelius M Ogasawara H Nilsson A Pettersson L G M |
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Institution: | Department of Physics, AlbaNova, Stockholm University, S 106 91 Stockholm, Sweden. |
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Abstract: | Using x-ray emission and photoemission spectroscopies to measure the occupied valence levels in a thin crystalline ice film, we resolve the ionization-induced dissociation of water in ice on a femtosecond time scale. Isotope substitution confirms proton transfer during the core-hole lifetime in spite of the nonresonant excitation. Through ab initio molecular dynamics on the core-ionized state, the dissociation and spectrum evolution are followed at femtosecond intervals. The theoretical simulations confirm the experimental analysis and allow for a detailed study of the dissociative reaction path. |
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