title: Novel geminate recombination channel after indirect photoionization of water.
abstract: We studied the photolysis of neat protonated and heavy water using pump-probe and pump-repump-probe spectroscopy. A novel recombination channel is reported leading to ultrafast quenching (0.7 ± 0.1 ps) of almost one third of the initial number of photo-generated electrons. The efficiency and the recombination rate of this channel are lower in heavy water, 27 ± 5% and (0.9 ± 0.1 ps)(-1), respectively. Comparison with similar data measured after photodetachment of aqueous hydroxide provides evidence for the formation of short-lived OH:e(-) (OD:e(-)) pairs after indirect photoionization of water at 9.2 eV.
authors.affiliation: Physik-Department E 11, Technische Universität München, D-85748 Garching, Germany.
authors.forename: Martin K
authors.initials: MK
authors.lastname: Fischer
authors.forename: Hubert
authors.initials: H
authors.lastname: Rossmadl
authors.forename: Hristo
authors.initials: H
authors.lastname: Iglev
mesh_terms: D000042:Absorption; D017666:Deuterium Oxide / Q000737:chemistry*; D004579:Electron Transport; D004583:Electrons; D006878:Hydroxides / Q000737:chemistry*; D010782:Photolysis / Q000528:radiation effects; D017785:Photons; D013057:Spectrum Analysis / Q000379:methods; D013997:Time Factors
chemical_list: D006878:Hydroxides; C031356:hydroxide ion; D017666:Deuterium Oxide